You need to find something to get your mind off of this. Seriously. You are experiencing hypochondriac pains out of some kind of sympathy. Have you considered a girlfriend, or an activity that takes your mind off this needless worry?
I did have a heart attack
in my late 30s (I had a bad diet, high cholesterol
, was overweight
, and didn't exercise). If you eat well enough, get some exercise, and don't have a family history, then you WON'T HAVE A HEART ATTACK.
Quit worrying. Go out and have a little fun. That'll help. You're working yourself up over nothing at all. If you want something to be "concerned" about, get a nice girlfriend and relax a bit!