One time I was at home, and suddenly my cehst started to feel weird. then it started to hurt, badly, on the left side. it shot through my back and shoulders too. I went to the ER. Turns out, I had an extremely minor heart condition - Mitral Valve Prolapse (the safest kind, which has a click but not a murmur, which means its benign.) But the thing is, it's impossible for it to cause that sort of pain. or any pain.
I was jsut so terrified that I generated that pain on my own. I was sore for days after. So I can say without question that your mind can manifest these symptoms out of nothing but fear.