sounds remarkably like me when i was 13. The Doc said "the muscles were to strong for the bone" and I "threw too hard" for my elbow to handle. I actually broke it though, had an avulsion fracture (muscles ripped off a hunk of the elbow) while i was throwing a pitch.
But anyways, I had to miss my entire summer season, and i was so devastated. And it just made it worse that we went to national championships and lost in the Semi's bcuz we ran out of pitching. Me and our ace lost our season to broken bones, and probably lost of National Championship bcuz of it. By the way, we had won Nationals the year before, we were going for the repeat.