Not to be a downer, but go get another opinion, there was some reason you were hurting and could not breathe. I had just the opposite thing happen, had an EKG at a normal physical, doctor told me I had had a heart attack, go to the hospital and pack a bag, you will be spending the night, kind of stressed me out, packed a bag, went to the hospital, had an EKG, it was good, ran on the treadmill, it was good, had a stress echo sonagram, it was good, nothing wrong at all, doctor told me I would die some day but probably not from a heart problem. Never never get just one opinion, please find another doctor to check you out. Morning is the time for heart attacks, a few years ago I worked on a Black Program, at least once a week at neary 9:00 AM sharp someone dropped dead from a heart attack, stress and the time of day all add up to get you. Larry