Stopping Ocrevus

Diagnosed with Primary Progressive MS 9 years ago. MRI shows lesions in my brain and a lesion in my spine. My ANA bloodwork was negative, but Neurologist is treating me with Ocrevus and have been on Ocrevus for 8 of the 9 years.
I am thinking of stopping Ocrevus as I am not sure that I have this disease. My symptoms seem to be progressing from Chemo and Radiation damage that I had 10 years ago for Colon Cancer. I do have Peripheral Neuropathy from Oxilaplatin for treating the cancer.