In reply to ReubenClimbs:
You could try emailing Volker Schoffl for advice - author of “one move too many”.
My wife had a 3 year saga with her wrist with no progress - he directed us towards a surgery option that resolved it, having spotted possible damage on her scans that were missed by the other health professionals we dealt with in the UK.
I would also buy Dave MacLeods book on injuries, has useful rehab advice. I’d also be submerging the hand in a bowl of water with 3-5 ice cubes in it, maybe 3 or 4 times a day, for c. 5 minutes. This improves blood flow (usually feels warm and “glow”ey for a while after). It sounds like you’ve gone beyond home rehab though...
Good luck, hope you can get it sorted.