Help me :(

Anybody else wake up with night sweats or just feeling weird.. my heart kind of feels like it’s fluttering, my left armpit seems to be on fire, my hands start sweating. I’m new to these feelings and have not been diagnosed. I did spend 3 separate visits in the ER thinking I was having a heart attack. And after blood tests, EKG, xrays, and a cardiac monitor doctors tell me everything is good and healthy. Yet I get these feelings that I’m not ok. Or like the doctors have missed something. Please someone else with these feelings give me a little advice. I mean if anything life threatening was actually wrong, the doctors would have caught it in all those tests right?