Heart beats very strong after standing up

[eciftcioglu]

Hello everyone. Sometimes when I sit up from a lying position or stand up from sitting, I feel a couple of very pressurized beats, my heart beats very strongly(not fast) for a couple of beats then the pressure is relieved. This does not happen everytime and normally when I sit up I just don’t feel anything. I have been to quite a few cardiologists and quite often too(I have PACs and PVCs my main reason I went to see cardiologists) and they don’t really have anything to say about it other than telling me its probably caused by stress. Has anybody had similar problems up on changing to a supine position. I am 27 btw don’t smoke, drink and am not overweight. I have had anxiety and panic attacks almost all my life and I am quite aware of whats going on in my body. I just can’t seem to find anything related to my problem at all. Its deiving me crazy.