Does anyone get really bad adrenalin rushes after excercising? I wind myself up, thinking if I push myself with excercise I will have a heart attack. My heart rate takes ages to come down and I think about it all the time. The adrenalin is awful after excercise I can't sleep, wake up sweating and get exhausted.please help, I'm trying to make myself fitter but this happens all the time. I've had loads of ECGs done but most are normal.