Welcome to HCM
We understand your concerns
I went through your problem description. People complain about such problems often and there is nothing to worry.
Pulsation of certain parts from inside occurs when the vein at that particular area is pressurized. You are feeling those pulsations and need to find out why this constriction.
If it is in the stomach or diaphragm are, then it is due to acid reflux
. Other regions pulsation need to be checked by a physician. Do visit a physician for further advice.
Hope this clears your doubt. Available for further clarification.