Not the fast hearbeat aka tachycardia but the strong thump out of nowhere, I hate it. Started in back in 2000. DOctors as usual say its benign. Its random and it does worry me. Hard to concentrate when the heart goes thump. More so at night. Everytime I wear a 24 hour heart halter monitor it never occures so i dont know what kind of beat it is. Trying to book in for a 1 month ultra sound portable machine to record it. After that I want to do a EPS which they send micro tubes from different points of your body into your heart and see where the electrical disturbance is and try to repair it by freezing off damage electrical pathways.