Dig up some documentation on PT post-Bankhart Repair surgery. Great strengthening to maybe keep you from needing the surgery itself.

Do everything you can to rehab, strengthen, and increase/maintain full range of motion.

I have a 3rd degree AC seperation its been a long time since it happened and you can still see the clavical sticking up a bit. I was supposed to have a screw inserted but thought the 12 weeks total imobilization wasn't worth it. (I was 17 at the time and would make a different decision today) What I did do was have a sling that immobilized the shoulder so that the muscles could heal up. When it wasn't sore any more I started doing light rehab work to strengthen the rotator cuff and get all the mechanics working together again. You may want to talk to a physical therapist for some electro stimution and ultrasound. A PT can also give you a list of exercises to help you regain your range of motion.