Hello and thanks for writing in at HCM
I have read your mail in detail. This type of feeling might be due to Anxiety
or related to heart problem like Atrial Fibrillation
or PSVT. Needs to be investigated. Do your EKG at the time of episode or try to count your heart rate
if it is in normal and your EKG is normal than it rules out heart problem.
For other problems try to be relax and sleep in time about 10 pm and don't take any type of stress like related to study or any other problems. Try to spend time with your dear ones and get fully relaxed. Overweight
can be a other cause for your problem. If your are overweight than try to loose weight.
If all this does't work than consult your doctor and get proper consulling and medication.
Beat Wishes and get well soon.