Hi dizzy and Welcome to NeuroTalk. WOW, you have definitely been through the medical wringer. I'm sorry, but I just don't have any answers for you, as by your sx's, it could be alot of things.
Sadly, you may have to wait till the Dr's are done w/their testing, but demand answers. Are you taking any meds that could be causing problems? I just went through a bout w/vertigo and I thought I would lose my mind. *no comments*
I am glad you found us though, as you'll find NT to be an amazing, friendly place.