This is purely anecdotal help. The vertigo I had in spurts about 5 years ago responded well to taking about 5 mg of manganese, maybe two three times a day. The vertigo would abate after I'd slept, after taking the manganese. It's available at health food stores, maybe GNC. But for sure at Vitamin Shoppe.
About 5 years ago, living in Albuquerque, I would get these spells and would fear driving because the road was moving to the right and I needed to vomit. I think this state is what you are mentioning as wonkihead.
I read in this Nutritional Therapy book by a husband and wife team, last name-Balch, he an M.D., she a nutritionist, that manganese is frequently lacking in people with ear problems. I showed the article to the ENT in Albuquerque. He read it and said, "if it works, what can I say?"
When the vertigo resumed two years after I moved to Austin, I was directed to the Emergency Room. They declared I'm so healthy, but gave me no help on my vertigo. I mentioned it to my siblings via E-mail. My sister in law told me the exercises her ENT or some therapist had had her do leaning her head off the bed in certain directions. I've done that and never had any more vertigo.
Take all this with a grain of salt, as it's just my experience.