Your screen name suggests that you might be in Canada? If you were in the US, I'd suggest a second opinion, and a new MRI. I don't know how easy it is to see a different neuro in Canada. Otherwise, it sounds like you've had all the usual testing done, without any firm diagnosis. I guess all you can do is keep track of symptoms, noting if any worsen significantly. If all your testing is coming back "normal", though -- even seeing a new neuro won't help, because if there's nothing showing up on the tests, he'll not diagnose anything either.
I'm sorry you're in limbo!