<s>[INST] Have been getting strong fluttering in my chest like my heart is about to explode. At the same time I get really short of breath an light headed an have also developed a metallic taste in my mouth an what feels like pins and needles in my mouth. Should I be concerned? [/INST] Thanks for your question on Chat Doctor. I can understand your situation and problem. In my opinion, we should rule out arrhythmia first in your case. Because arrhythmia can cause irregular, rapid heart rate. And this can be perceived as fluttering feeling in chest. So get done1. ECG2. 2 d echo3. Holder monitoring (24 hours recording of ECG)If all the above are normal then no need to worry about arrhythmia. Anxiety can be the cause. Your metallic taste and needle like feeling in the mouth can also be seen in anxiety. So better to avoid stress and tension. Be relax and calm. Consult psychiatrist and get done counselling sessions. Try to identify stressor in your life and start working on its solution.Don't worry much, you will be alright. </s>