I couldnt really tell you what it is but my guess would be its not heart related! Chest pain can be caused by all sorts of different things, if you've been to the e.r already while having these pains and they didnt find anytihng wrong i wouldnt worry to much about them unless they start getting worse! I think you should make a follow up appt with your family doctor and let him no whats been going on, just to be on the safe side and give you a bit of peace! i'm only 27 and i have chest pains all the time, the doctor never did figure out what was causing them! Good luck!