I am 20 year old female. I am 5'4" 145lbs. About a month ago I had about 3 of what I thought to be panic attacks. Since then my chest has been "uncomfortable". Example, maybe a sharp pain if I turn too quick. Today though I got a very sharp pain above my left breast. It was sharp and throbbing. It only lasted about 2-3 minutes. While it was happening it freaked me out and my heart started pounding, I drank some water and layed down and it stopped. But my chest is still feeling a little uncomfortable. Like I said I am only 20 but I do smoke and I am afraid something is wrong with my heart. What does this sound like to you? Thanks.