Out of curiosity, has either doctor brought up Lupus (SLE) as a possibility? It can mimic RA to an extent. But can present neurological symptoms too. And is a very close 'family member' of autoimmune to RA.

I'm in my own hunt for an autoimmune disorder after some blood work, I should get the word (fingers crossed) on what is maybe when I get to see the rhuemy. But RA and Lupus were both ruled out for my by the results of the same test. It's called an anti-DNA, that goes along with an ANA.

ANA checks the levels of inflammation, and the anti-DNA checks for specific antibodies consistent with lupus as well as RA and a few other autoimmune disorders.

It's not unlikely to be given RA as an initial dx that later changes to lupus, it's not that the disease changed any but you may advance to a point where they can see the symptoms treading towards on over the other, that can't always be pulled straight from the blood tests.