--were your MRI's done?

Given that your symptoms were originally lower body, did they just image the lumbar spine, or did they go up the ladder as well, with imaging of the thoracic and cervical spine and even the brain?

The problem, when looking for symptoms caused by damage to the central as opposed to the peripheral nervous system, is that while damage to nerve ROOTS--the first peripheral nerves that exit the spinal cord--tend to have effects in fairly specific anatomical regions (known as dermatomes), damage to the spinal cord itself can cause symptoms anywhere from the level of the damage on down, given that the cord contains vertical nerve tracts. And upper cervical/thalamic/brain inflammation may cause symptoms almost anywhere.