Has your Neuro ruled out anything related to the spine? Has he checked for lesions?

Your spinal cord might be compressed in the lumbar region or cervical (neck) region. I had been diagnosed with possible MS. Also to find issues with my whole spine. My leg numbness. Spasms and nerve issues were caused by claude equine.
I was losing my ability to go to the bathroom. The nerves come together at the end of the spine thus called equine or horses tail. Mine were being squeezed and the nerves were being cut off.

Had L4-L5 laminectomy with fusion and my symptoms went away. I still have the effects of the optic neuritis. Partial vision loss and color. Migraines and stiffness and spasms still plague me. Right hand drops things. But I can pee now, yeah. They said if I would have waited, I possibly could have been paralyzed.

Hope you find relief but in my opinion. Have them rule other things out.
I still have a possible MS dx, but found my spine needed some work.

God Bless Snoopy.