s syndrome--worsening of symptoms with exercise or
heat. It is usually seen in
Multiple Sclerosis, however can be seen in other demyelinating conditions (any condition that takes the covering off the nerves). Sometimes Autoimmune conditions can also cause this condition.
You will likely need a further workup by your neurologist including MRI spine and brain w/wo gadolinium, and another lumbar puncture, this time looking for inflammatory and demyelinating markers.