Why does my arm hurt like a stabbing pain?

I have been playing dodgeball this week and i can throw... until my arm kills me. I was pitcher a long time ago. Idk if that helps. But it is a sharp stabbing pain above my elbow part of the arm. It gets so bad that that arm gets so weak i cant even lift it and it shakes severly i thought if i took 400 mg advil it would help but nope. Any answers?