AW Laura, my Inka has same ilness! She has CH too. We noticed this because she was always losing her balance! She also has NO coordination between her 4 paws, so whenever she wants to run, she falls a lot, or does salto's. Even with that CH, she is a very happy cat. She might get worse when she grows older, but she has learned how to live with it.
I am sorry to hear that Amy canot go potty on her own anymore; it would break my heart too

((((((((( hugs !!!))))))))))