I sometimes get this pain on mu left side of my chest like a sharp pain, it only last for a few secs, but its weird i cant tell if its like my boob or just a chest muscle, it sorta feels like my chest muscle is spasming, or tigtening, but my chest doesnt feel tight, like pulling (confusing i knows)sometimes i get it on my right side, but mostly its my left. I feel ok, I can breathe fine, so i dont think its my heart, but its scarry ya know? I went to the dr. and he said i was fine. anyone ever have any pains like that?