i Just came back from magic moutain today (went there yestrday) and on the way home which is like a 5 to 6 hour ride in a car my left lower back and leg hurt badly! but i figured that was because i was sitting for so long and it went away after i got out of the car. But recently i started to get extremely sharp pains in my upper right back. It feels like someone is stabbing me, and it hurts my breathing when the pain occurs. The pain comes and goes.. and i don't know if i should be worried. or if i should go to the doctors tonight or not. can anyone help me??