Mitra,
Thanks for the post.
If you think that you may be having a heart attack, then dial 911. The internet is not a good
mediumMedium chain triglycerides for making or refuting this diagnosis.
The sensation that you described could range from something benign, such as a PVC (premature ventricular contraction), to something serious. You need to speak with your doctor to help sort this out.
Good luck.