if the difference b/w the shoulders is that the injured one kind of sags compared to the unaffected one, then that is to be expected from a recent dislocation as the muscles are still in a little shock so aren't contracting as much and the other passive structures that hold your arm on your body have been stretched out; good news is that with proper progressive exercise you can likely regain full use of your shoulder and go back to all activity; bad news is that you may be slightly more susceptible to dislocating again if you take a bad spill and get your arm wrenched around again and some orthopedic surgeons use three dislocations in one year = surgery as a rule of thumb; there are plenty of protocols online regarding rehab from dislocation; read up on precautions before you get started though...gotta run. good luck