i use to play softball in 6th grade & i was pitcher, couple months later i swim season began & i couldn't do it, my arm felt week and i had this pulling feeling on my right arm which i use to pitch with. last summer 2010 i played softball again this time i was catcher & the couches would make me throw to hard where i started to have the arm trouble again this time it was my bone & joints they would pull every time i threw a ball. I'm in high school now i'm not plying softball anymore but i am on the swim & water polo team . My pain has increased where when i swim my arm gets to weak to move or i have a jabbing feeling inside. About a week ago i thought i got a cramp on the upper part of my right arm but it wasn't a cramp. i have this strange feeling were my arm gets tight or i feel as if my tissue or something inside my arm s pulling. I don't know what to do about this please if you can figure out what could be wrong it would mean so much to me !:)