I have been having palpatations ,bad for the past year. Have had EKGs, blood work , Gallbladder removed, and recently had a Fundoplication procedure done. Have suffered with acid reflux real bad ,so the fundoplication fixed that problem, but still have the palpatations, I also will get them just sitting, or bending over, and yes mine also flare up around 8 pm I dread going to bed ,I'm tired and within minutes, BOOM they flare up , and then up I am. The Dr. has called this Dumping syndrome . It's when your food passes to quickly through your stomach ,and immediatly turns to sugar.. So Laying down right after you eat, for a half hour, do not drink any liguids half hour before meals and half hour after.. Ya that sucks, but if you do need to just a sip.. This works great, not always convienent, I just had a colonoscopy done and found I have diverticulitus, I have changed my diet so immenslly, that i cheat myself out of alot of goodies. I have been told in bold letters NO IT IS NOT YOUR HEART.. it feels like it is.. Your not alone, i hope what lil i have posted will help someone suffering with these issues, feed back would be great.. Good luck to all out there suffering with this annoying problem..