I've gotten so much comfort from just reading related stories on this site. I too have had terrible pain, spasms, etc. in my chest which have landed me in the ER on multiple occasions thinking it was a heart attack. Through several months, 3 different doctors, gallbladder surgery, and finally an endoscopy I had a solid answer. GERD! I am familiar with the odd feelings, nervous/lightheaded/sweaty/pounding heartbeat. I've come to the conclusion that it's all related to the GERD. I just have to try to settle down and tell myself that there is nothing wrong. It's easier said than done sometimes. Good luck and be strong to everyone who feels these feelings