A wait of 2 years to see an MS specialist????

That's really unacceptable. There's an MS Society where you are, I think? Have you tried contacting them and asking them to verify that the wait is really that long, and then asking them if anything can be done to change that situation?

I had lots of problems with Lhermitte's sign in the first year or so of MS symptoms, and then never had that problem again. But everyone is different. To this day I find it difficult to tilt my head back or to look up at anything high up. That was often a movement that brought on Lhermitte's sign though it came on at other times too.