Hi Dan,
I also had a negative spinal tap six years ago but recently dignosed with MS. The neuro got really close to making my dignose of ms but failed. Now i feel i had ms all the time. I have had several things going on that leads to ms now that i think back. Bladder problems, legs aching ,very fatigue, vision problems(seeing double).
I know now the Dr. missed dignosing me six years ago. I just found out for sure i have RRMS. Found out right before Christmas. I still have not got on a regular medication, but will soon.
Best of luck !
MSMALE