I'm so sorry you are in this 'catch-22', and WorkComp to boot.

One of my first thoughts was wondering if you'd respond to a SNB (spinal nerve block) Injection to determine if your condition involves the sympathetic nerve chain, BUT I've also seen many cases of RSD Spread once you start getting into the more invasive diagnostic procedures....

On one hand you're wise to 'procede with caution', yet on the other, if it IS RSD, you want to tx it asap, as the others mentioned.

I pray you find a specialized Dr who will target both of these conditions without giving you the 'runaround'.
Have you had any recent bloodwork done as a starting point to rule out autoimmune issues ....
Thyroid ok?

Caring
Rae