Treating the symptoms is a good idea at this point. Has your dr. run any other testing for other things that may be causing this? You may have posted that and I missed it.

Lesions can be caused by many things beside MS including migraines (which can also cause neurological symptoms). I hope that they figure this out soon for you so that you have a name to go with your symptoms. Hang in there and let us know how you are doing!