i had a heart attack about ten years ago a circumflex type, a stint was put in, lately I have been having a coolness feeling and a tightening feeling in my chest then I decided to change my diet and eat only fish, oatmeal, and vegetables for about a month. The pain slowly went away and sometimes come back but not as much as before. Is this symptoms suggesting that I should get some nitrous pills to help with this condition, or do you think it could be something more serious? I am on alteneral, acentipril, nyaspan, lipitor, and 325 mg of asprin everyday.