@arlenelmh I’ve been trying to figure out how best to help you understand the drugs you are/are not taking. I, too, took prednisone and cellcept, and, to be honest, I was very nervous!
https://www.drugs.com/compare/cellcept-vs-prednisone
This book on drugs gives you a side by side comparison that you may find helpful. You may also want to have a frank discussion with your doctor about your chances of bad reactions if you take the drugs. You can also talk with your pharmacist about the drugs. As for getting therapeutic plasma exchange or CAR-T treatment, they are only used if the other treatments fail. Please, just think about all your options.