Check into the DSHS for your state. It's under Division of Vocational Rehabilitation. In years past these programs had funding to help pay for training. Not sure that is still the case, it may vary state to state, but they can help with assessment and access to grants etc. Even if they don't pay for costs directly.

I can't remember if you had MRI and or ultrasound on that hand. Did you get a second opinion? Someone really ought to look at your thumb without attributing it to the wrist to be sure. You could have a whole other problem in that area as well. Whether a nerve block could help may depend on what is going on in there.

sending hugs,