Hello welcome to your GBS/CIDP family. You are not alone! Maybe it doesn’t really matter what causd it although I can understand if we knew the cause, we could find the cure. I have not had cancer & radiation, I did get bitten by a spider 30 + years ago. It was never seen, the Dr. said it was a brown recluse. In my oppinion you really should have had a loading IVIG of 5 in 5 days, then one every 3-4 weeks. And lots of B-12. We are all glad that you can walk like a duck. By the way do you also have hair loss, difficulty swallowing, metal taste in your mouth, loss of appetite?
You are in my heart & in my prayers.