<s>[INST] I recently turned 20 and just last month I started to have trouble breathing along with my heart beating really fast I feel.as if its popping out of my chest! It does this several times a day. I can t breathe deeply anymore unless I concentrate. What do I do,?? [/INST] Thanks for your question on Chat Doctor. I can understand your problem and situation. In my opinion you are having anxiety mostly. But better to rule out cardiac and pulmonary cause first. So get done ECG to rule out cardiac cause and chest x-ray and PFT (pulmonary function test) to rule out pulmonary cause (asthma). If all are normal than no need to worry much. Anemia and thyroid problems can also cause similar symptoms. So get done CBC (complete blood count) and thyroid function test (TFT) to rule out anemia and thyroid problems respectively. If all of the above are normal than you are having anxiety only. So consult psychiatrist and get done counseling sessions. Try to find out stressor in your life and start working on its solution. Avoid stress and tension. Be relax and calm. Don't worry much, you will be alright. </s>