user19497: I am a graduate of Islamic metaphysics and theology with a focus on mysticism and mystical philosophy. I have kin interest in spirituality in general. Recently I started trying out meditation. In the past I have had experiences of energy building up in my chest during contemplating mystical works. And I have had attempts at out of body projection without full success yet. But in either cases massive energy building up in my chest has been a familiar occurrence.
Now recently that I started the Indian style meditation, i.e. sitting in one place, chasing out thoughts and concentrating on heart beats, while gazing at the back of my closed eyelids, I feel massive energy rushing to my chest, building up there and then rushing further up into my neck. At the same time my upper body starts shaking stronger and stronger. More recently, I felt as if my jugular vein was about to explode and I felt mild pain on the back of neck.
I want to know what the heck is this all about? My feeling is that if I continue I may project out of body, as this was the feeling that I had when trying out of body projection back in older days but the pressure becomes almost unbearable. I feel nervous to continue the meditation with these twitchings and sensations.

user20365: That sounds like the effect of at least one of the Five Hindrances.
Observing where this stagnation is physically or metaphysically and what comes to mind in practice may lead to an enlightenment on an attachment restricting your capacity to continue any further.
A small conditioned limitation, like a fear of spoons can impose on an individuals life considerably. Any of the hindrances may have a similar bottleneck effect.
Attempting to "push through it" can be done, although that would be not unlike taking a hammer to a fine tuned machine; understanding limits is very admirable in circumstances such as what you have described.
While temporary limitation was wise, it doesn't mean to shy away from the practice altogether. Acting within compassionate reason, using unbiased insight for obstacles and striving for perfection are ideals worth keeping in mind.
Cultivate in harmony

user19437: There are no "good" answers to questions like this just as there would be no "good" answers were to someone ask about why the microwave sometimes heats your dish instead of your food.  It just happens.  You're better off just resetting the timer and trying again.  Eventually your meditation will cook properly.  If you attach to experiences like this, you are in essence eating cold food.

user-1: You can try focusing on the arising, persistence and the cessation of thoughts, feelings, sensations & perceptions in general and when you get these weird states in particular.

There is the case where a monk, when feeling a painful feeling, discerns, 'I am feeling a painful feeling.' When feeling a pleasant feeling, he discerns, 'I am feeling a pleasant feeling.' When feeling a neither-painful-nor-pleasant feeling, he discerns, 'I am feeling a neither-painful-nor-pleasant feeling.'"When feeling a painful feeling of the flesh, he discerns, 'I am feeling a painful feeling of the flesh.' When feeling a painful feeling not of the flesh, he discerns, 'I am feeling a painful feeling not of the flesh.' When feeling a pleasant feeling of the flesh, he discerns, 'I am feeling a pleasant feeling of the flesh.' When feeling a pleasant feeling not of the flesh, he discerns, 'I am feeling a pleasant feeling not of the flesh.' When feeling a neither-painful-nor-pleasant feeling of the flesh, he discerns, 'I am feeling a neither-painful-nor-pleasant feeling of the flesh.' When feeling a neither-painful-nor-pleasant feeling not of the flesh, he discerns, 'I am feeling a neither-painful-nor-pleasant feeling not of the flesh.'[...] Or he remains focused on the phenomenon of origination with regard to feelings, on the phenomenon of passing away with regard to feelings, or on the phenomenon of origination & passing away with regard to feelings. Or his mindfulness that 'There are feelings' is maintained to the extent of knowledge & remembrance. And he remains independent, unsustained by (not clinging to) anything in the world. This is how a monk remains focused on feelings in & of themselves DN22

When you have distracting thoughts you can try following these instructions. for their removal.
I would advise you to keep it simple and just focus on  ie a contemplation or just the arising, persistence & cessation of sensations associated with breathing or the heartbeat.

19497: <p>I am a graduate of Islamic metaphysics and theology with a focus on mysticism and mystical philosophy. I have kin interest in spirituality in general. Recently I started trying out meditation. In the past I have had experiences of energy building up in my chest during contemplating mystical works. And I have had attempts at out of body projection without full success yet. But in either cases massive energy building up in my chest has been a familiar occurrence.</p>
<p>Now recently that I started the Indian style meditation, i.e. sitting in one place, chasing out thoughts and concentrating on heart beats, while gazing at the back of my closed eyelids, I feel massive energy rushing to my chest, building up there and then rushing further up into my neck. At the same time my upper body starts shaking stronger and stronger. More recently, I felt as if my jugular vein was about to explode and I felt mild pain on the back of neck.</p>
<p>I want to know what the heck is this all about? My feeling is that if I continue I may project out of body, as this was the feeling that I had when trying out of body projection back in older days but the pressure becomes almost unbearable. I feel nervous to continue the meditation with these twitchings and sensations.</p>
 20365: <p>That sounds like the effect of at least one of the Five Hindrances.
Observing where this stagnation is physically or metaphysically and what comes to mind in practice may lead to an enlightenment on an attachment restricting your capacity to continue any further.</p>
<p>A small conditioned limitation, like a fear of spoons can impose on an individuals life considerably. Any of the hindrances may have a similar bottleneck effect.</p>
<p>Attempting to &quot;push through it&quot; can be done, although that would be not unlike taking a hammer to a fine tuned machine; understanding limits is very admirable in circumstances such as what you have described.</p>
<p>While temporary limitation was wise, it doesn't mean to shy away from the practice altogether. Acting within compassionate reason, using unbiased insight for obstacles and striving for perfection are ideals worth keeping in mind.</p>
<p>Cultivate in harmony</p>
 19437: <p>There are no &quot;good&quot; answers to questions like this just as there would be no &quot;good&quot; answers were to someone ask about why the microwave sometimes heats your dish instead of your food.  It just happens.  You're better off just resetting the timer and trying again.  Eventually your meditation will cook properly.  If you attach to experiences like this, you are in essence eating cold food.</p>
 -1: <p>You can try focusing on the arising, persistence and the cessation of thoughts, feelings, sensations &amp; perceptions in general and when you get these weird states in particular.</p>
<blockquote>
<p>There is the case where a monk, when feeling a painful feeling, discerns, 'I am feeling a painful feeling.' When feeling a pleasant feeling, he discerns, 'I am feeling a pleasant feeling.' When feeling a neither-painful-nor-pleasant feeling, he discerns, 'I am feeling a neither-painful-nor-pleasant feeling.'&quot;When feeling a painful feeling of the flesh, he discerns, 'I am feeling a painful feeling of the flesh.' When feeling a painful feeling not of the flesh, he discerns, 'I am feeling a painful feeling not of the flesh.' When feeling a pleasant feeling of the flesh, he discerns, 'I am feeling a pleasant feeling of the flesh.' When feeling a pleasant feeling not of the flesh, he discerns, 'I am feeling a pleasant feeling not of the flesh.' When feeling a neither-painful-nor-pleasant feeling of the flesh, he discerns, 'I am feeling a neither-painful-nor-pleasant feeling of the flesh.' When feeling a neither-painful-nor-pleasant feeling not of the flesh, he discerns, 'I am feeling a neither-painful-nor-pleasant feeling not of the flesh.'[...] Or he remains focused on the phenomenon of origination with regard to feelings, on the phenomenon of passing away with regard to feelings, or on the phenomenon of origination &amp; passing away with regard to feelings. Or his mindfulness that 'There are feelings' is maintained to the extent of knowledge &amp; remembrance. And he remains independent, unsustained by (not clinging to) anything in the world. This is how a monk remains focused on feelings in &amp; of themselves <a href="https://suttacentral.net/dn22" rel="nofollow noreferrer">DN22</a></p>
</blockquote>
<p>When you have distracting thoughts you can try following these <a href="https://www.accesstoinsight.org/tipitaka/mn/mn.020.soma.html" rel="nofollow noreferrer">instructions.</a> for their removal.</p>
<p>I would advise you to keep it simple and just focus on  ie a contemplation or just the arising, persistence &amp; cessation of sensations associated with breathing or the heartbeat.</p>
