Ra & Cidp(?)

I have Adult onset Stills Disease, rare form of Juvenile RA. Onset seven years ago, was on life support for a week it caused inflammation around my heart and in my lungs, my wife said my whole body swelled. Iam now on 5mg pred, 8 tabs of mtx. Now may have CIDP, go for a biopsy in two weeks. I winder if the meds I take mask some of the CIDP. See neurologist at Johns Hopkins