Bill has the same issues with vertigo..blacking out...etc., but he is an Old Fart like David

He has been seeing a balance expert and doing therapy to help with it. He says it has helped.
You are pretty young to be having this but with all your treatments/surgery, who knows. I would definitely be suspicious of any med change but you are on the mark with seeing your physician (I know..in your spare time.)
Sure hope you can get to the bottom of this...its scary to drive or go anywhere when you think you might pass out or fall at any time.
Deb