Sounds like adhesive capsulitis.
Yes, I agree... adhesive capsulitis, or frozen shoulder. I had it for 7 months. Did pt, then finally got a cortisone shot in the back of my shoulder.
That was my first thought too -— adhesive capsulitis, aka “frozen shoulder.” Google around a bit and see if it rings a bell.
I agree with Lydia. If the doctor did not eliminate adhesive capsulitis, it might be worthwhile to try the following:
Stand up straight with arms to your sides, Bend the painful arm at the elbow only, so it is straight in front of you, with your hand oriented so the thumb is “up”. Have someone slowly pull and push on your extended hand while you try to resist. If you have pretty much nothing in the tank (yet your other arm is strong when you test it), you might have a.c., and need a new orthopedist.
In my experience, A.C. hurt like the dickens, but was easy to fix with massage, stretching (by a therapist), and exercises. Good luck.