I been suffering of the same exact symptoms for over 30 years. When they injected the gentimicin in my left ear the vertigo and attacks stopped for almost 20 years. Now they are back....Menieres it's an autoimmune disease. Neurologists don't do anything for it.
If you are near Long Island NY, the best at this is Dr. Vambutas at LIJMC in Long Island, she is the only one in the country that can prescribe injections you give your self everyday to suppress the immune system.

Good luck!