I agree with Snoopy that a MRI of your C and T spine would be in order, if you haven't had one already.

Have you had a lumbar puncture/spinal tap? It can be an unpleasant & invasive procedure, but there may be other conditions they could be testing for, like a bacterial infection or virus in your spine. If things get very difficult for you, I would consider pushing for that test as well.

MS sometimes does not reveal itself for some time, even on a MRI. In the meantime, I would strongly suggest that you keep a diary of your symptoms and timing, as this may prove invaluable in the future.

Cherie