You are getting well checked by doctors. It takes a while usually to get an MS diagnosis.
B12 deficiency is not the only condition that mimics MS...there are other diseases with neuro ramifications. Keep looking, and I hope they give you something for pain. I didn't get a dx despite many symptoms until I had optic neuritis. As Sally said, this is often a first symptom to bring a diagnosis, partly because there are eye tests they can perform. The neuro-opthalmologist was the first doctor to dx me with MS.