I'm 37 and always been physically fit and well. 2 years ago I was running and suddenly felt a "thump" in my chest then my HR went up and I had pain in my chest, left arm and neck. It made me feel quite unwell. I told my GP who referred me to cardiologist. These episodes happen whenever my hR goes above 140. I had all the usual tests then yesterday went in for an electrophysiology study. The specialist told me that my electrics in my heart were all normal....which is great. Problem is when they set my heart off it didn't feel anything like it does when I exercise. I know it's positive that I don't have an electrical issue but now I'm worried I'll just be labelled as being anxious!