I have been the same for 13 years now. Before that I was great. It all started a few hours after getting really scared. Something happened that scared me so bad that after this it all started. My heart beats so fast and strong that sometimes I think it's going jump out of my chest. Sometimes I go to sleep then in the middle of the night the fast beating starts and I have to get up. I have to sit upzip water take deep breaths in and out zip more water slowly it starts to go back to normal after 1-2 hours. Finally I can go back to sleep. I think it all happened cause of my big scared but not sure. I just wish it would go away.