Ttff44 I have some similar symptoms to yours, although perhaps not as extreme. I was initially told that I had labyrinthitis, but it turns out I may have chronic migraine associated vertigo instead. I have not seen a neurologist so it has not been officially diagnosed, but my VRT therapist thinks this is a likely diagnosis.
I can give you some links to articles on MAV if you like? Perhaps you could discuss it with you neurologist.