Well a few times in the last two months and just about an hour ago I had a tightening in my chest that alarmed me but it was hard to tell what came first. I was with a client at work but was rushing to bring my wife to a doctor apt at the hospital but I almost drove around to the er myself. Still have some tightness. I get lightheaded sometimes and I feel like my hear flutters yet I completed a vigorous workout at noon....??