Reflex Sympathy Dystrophy or RA?

Saw my rheum who sent me for MRI of my left hand due to terrible hand pain bilaterally and X-rays of all joints bilaterally. All negative.
8 weeks ago I had rotator cuff repair surgery and now have a frozen shoulder. My orthopedic surgeon says I should have progressed by now and the pain should have let up. I am in intense pain. He's going to do a bone scan monday to make sure theres no injury before he does an epidural in my shoulder. If bone scan is clear, I'll have the epidural/nerve block. He is worried that I have RSD- Reflex Sympathy Dystrophy. If this is what's in my shoulder, I wonder if it's also in my hands.
I have to use my knees to drive because it hurts to have my hands on the steering wheel. I can't open things, and my hands hurt all the time. He said if it is RSD, he'll have to act fast.
This may also explain why my rheum can't find anything on scans. FYI-my ANA is positive and my full body bone scan showed uptake in all joints bilaterally, arthritis. My rheum won't diagnose me because he said there's no inflammation.
Has anyone ever heard of RSD?
WORRIED

Thank you. I'm sorry for your diagnosis of RA. I had my bone scan yesterday and will see my orthopedic surgeon Thursday. I'm anxious about the possible diagnosis. Thanks for the prayers and hugs.