I am a 18 year old Long Distance runner. I have been running since 6th grade. I suffer from Anxiety. I keep thinking that one day Ill just suffer from a H.A or C.A during a run. I once went to the E.R for rapid heart beating. And and EKG and chest x ray came out fine. So did blood testing. Why do I worry so much? If something was wrong with my heart they would've detected it right?