You just explained exactly what I did last year and ended up having arm problems. I ended up having to go to physical throwing during the winter to heal and then strengthen my arm. After that I think my coach realized to lay off so much pitching. People gotta remember we're still kids not fully grown..and we're people who aren't invincible so you have to be careful with your body. I almost didn't want to pitch anymore because of the pain but all that is behind me and I don't pitch as much as I used to but now at a pretty good amount.