HT,I am sorry to read of your issues. I have had the same issues and mine was caused by an inner ear problem.
Have any of your Drs. mentioned Meniere's disease ? Just a thought that you may want to ask your Dr. about.
Meniere's disease is a disorder of the inner ear that causes spontaneous episodes of vertigo — a sensation of a spinning motion — along with fluctuating hearing loss, ringing in the ear (tinnitus), and sometimes a feeling of fullness or pressure in your ear. In many cases, Meniere's disease affects only one ear.
I am sorry you have to go through this and please know I support you.