Hi and welcome,
I have most of the same conditions as you and have just my 2nd appointment with a pain management doctor. It's such acrazy process. I see a rheumy and he rx some of my meds, my PCP prescribes some and then my oncologist (DCIS) also RX some.
As for the PM doctor, he told me with RA there is only about a 50% chance the meds will work, but I'm trying the steroid injections in the lumbar spine and then in the Cervical Spine area I believe. The way I look at it, I have nothing to lose. The pain gets so bad I can't stand it. From what the PM MD said it's caused by the RA. The inflammation in that area is compressing on nerves.
See what your rheumy says but wouldn't be nice to find someone who could treat all aspects of this disease.