During and after radiation treatments for a brain tumor I had severe vertigo and hemifacial spasms. I took Klonapin for both. It helped a lot. It was prescribed by a neurologist and from what I learned online seemed to be a fairly common treatment.
I am sorry you are having to go through it. I hope it subsides soon.
Vertigo is the sensation and appearance that everything around you is moving. You feel like you're spinning or bobbing up and down or falling in space when you are actually stationary. Things around you will actually appear to be moving when they are not. It's horrible.
I get different versions of Vertigo off and on. Sometimes the full on spins, sometimes just the sensation of moving when I am not. Sometimes I can just feel that fuzzy feeling in my head and neck and know that I am about to go into a episode.
I have found that a homeopathic product called Vertigoheel (by Heel) helps me a lot. Sometimes I have to take it every 15 minutes for 4 or 5 doses but it will usually head it off before it gets going.
I also find that stretching and rubbing my neck and shoulders helps a bit but the Vertigoheel is the best.