Have you had an mri? That is one of the tests for MS...if your doc thinks that might be the problem, then he will set you up for one. Also, have you been to see a neurologist? That is another step in possible dx for ms...understand it is hard to dx Lupus and it is even harder to dx MS.
Rob might have posted on the other post, but I will say he has both Lupus and MS...he would be the best person to answer your questions.
I have promises to keep and miles to go before I sleep, and miles to go before I sleep.......Robert Frost