Great advice @MuskyShane! We had something similar happen to my oldest at the tail end of his college sophomore year at the NCAA regionals. He was their #1 starter all year, and something just wasn't right when he got to post season. Coach had to take him out of the game, My oldest son is a pretty even keeled person who doens't get too excited or down. I've never seen him so disappointed than at that moment.
He worked a summer internship (8 hours away from home) at the University and getting medical advice and treatments over the summer through the University training staff and a nearby sport medicine facility. I wish we had the opportunity to get a second opinion over that summer. Throwing injuries are complex as we learned. Bottom line is that he missed the Fall and Spring of his junior year. He was back on the bump his senior year, but it was a long, strange trip getting back there and getting back the confidence of the coaching staff.
Definitely wish we had gone to a doctor that specializes in throwing athletes.
Just my experience.