RA has few "fun" causes. Sorry you had/have one of them. Many of them are very recoverable, so hopefully that ends up being your path.
My personal greatest fear is have cancer, have the executive function portion of my brain destroyed by chemo, then survive. I empathize strongly with your situation here
If your former employer had LTD insurance, you may still be able to qualify for it. Look into that for financial support.
Look up your old professors directly, explain what happened. Explain why you can't recognize them, then just ask them to audit the course again. They'll remember you, and will likely offer something.
Additionally, bring yourself up on exceedingly new technologies (ember, helios, etc), that NO one has experience in. Then when you're someone who knows all the latest stuff, rather than someone who forgot some slightly stale stuff.