I had shoulder problems, not as bad as yours, but when I shot, I'd have to anchor my right hand and nocked arrow and extend my left hand upward. Then I was able to lift it into position. I wasn't able to draw straight back with my right arm without pain. I went to physical therapy for 2 months, nothing really heavy, and I was able to get full mobility with the arm. Never had any dislocations, but since we're not doctors, let them tell you what the problem is before it gets worse. You might be able to wear a brace or something. Won't know till you go. Good luck.