Yep --Sally's right - that does suck gravel Craig. To me it almost sounds like a guessing game anyway. Just a process of elimination-- and now you can eliminate MS. At least it narrows it down a little but I can imagine how frustrating it is.
I was dx with epilipesy and Gipson-Barr before they finally decided on MS. And now my new neuro has a whole different idea on MS....he disagrees with most of what my frist neuro said (I do too) but it just makes ya feel so guarded about everyting any of them say.
Good luck to you -- I hope whatever it is -- it is treatable and you get on with you life.

Gail
PS -- were you on the MSworld board-- your name and picture look familiar.