I’m also not sure I’m understanding the term “visual vertigo” correctly (since I don’t seem to have computer screen issues) - does that include “motion intolerance?” When I used to move my head, either from side to side or up and down, that would set me off. I think it was the visual part of it that goofed up my brain - so I’d have an illusion of continued motion, even though my head would only make a short move in some direction. That’s why the word “vertigo” never seemed to fit me too well, as I always associated that with a spinning sensation, which I didn’t have.
Anyway, this illusion thing was on top of the daily wobbliness, plus I also had the dizziness episodes of varying severity that would hit me with no warning (boy, I don’t miss THOSE days!). So if this head motion intolerance (because it brought on the illusion of continued movement kind of dizziness) is visual vertigo, then topamax helped me to get over it. Plus I’m sure graduating from perimenopause to menopause (wild hormone swings calming down) helped, too.