Sorry to hear. Do not feel bad about continuing to wrestle though (as this is probably where you were injured). Your spirit, ability and athleticism are what got you the appointment, and sitting out senior year for fear of an injury as some joke about, simply does not match the drive you have evidenced by getting the appointment.
Now, to the shoulder. I would find the best surgeon you can, one who deals with high profile sports injuries, professional team doctor type surgeon, with a CV that is as long as book. Make sure the surgeon knows of or has dealt with DODMERB in the past and can structure his treatment and care and opinions in a way that you have a strong argument to pass DODMERB or receive a waiver.
On a more concerning note, DS had knee surgery a few years before USMMA, and DODMERB had no issues with it at all. Didn't even request additional back up, re-exam etc. He also had a grade 1 shoulder separation, that was non surgical, treated just with therapy and time. Both injuries were treated by the local NFL and MLB surgeon. He faced followup questions from DODMERB on the shoulder which the doctor had to address. After that was completed, approval came. A top notch surgeon is what you need, not only for the result, but also for the resulting follow up questions that may arise.