painful shoulder with little to no mobility

I went to the orthopedic doctor last week, another doctor thought i may have a tear in my muscle, he moved it around and i heard a popping noise and intense pain...he gave me a cortisone shot...by the time i got to the front to check out I was literally crying. I cried for 2 days couldn't raise my arm like before the shot just now it was a thousand times worse. It has now been over a week..had a mri today. Still in intense pain and can not use my arm or raise it. I have a hard time sleeping because of the pain..he gave me strong pain meds and a muscle relaxer and all it is doing is taking my mind off the pain. Has anyone else experienced this? It feels like my shoulder is locked or if someone is holding down my shoulder so i can not raise it..it tends to pop in and out of joint...this all began 5 years ago after a car wreck...I was diagnosed with a separated shoulder, same doctor put a shot in my shoulder and it fixed it..like immediately, started having problems again a few years ago..now this..can anyone help? Tweet