Arm Pain

I am an advide basketball player and softball pitcher although i do not picth as much as i play basketball. Yesterday i had an hour private lesson with an ex college basketball player and it was mainly focused on shottig free -throws yes it was about 30 minutes of free-throws free-throws and more free-throws. at the time there was no pain at all in the upper arm but when i got home i did about 50 push-ups bu tnow the next morning i can not raise my arm above my head nor can i do nay kind of pitching or basketball playing nor can i do my push-ups. any ideas of what this could be….
thanks