Hi since no one has answered I did a little research - first off vertigo - I do get it ocassionally - but its usually when I move too fast - so I chalk I up to hypotension, rather than rads damage- but with rads aimed at your cheek, or neck, it's definitely possible since there's generally a certain - amount of spray hat hits other areas. (inner ear?!!) that said I found a few postings similar to yours an meds didn't help but apparently There's such a thing as the brandt-daroff exercise for vertigo - and apparently others have had the same issue. As for the last rads -- I'd do it vertigo or no.god luck! Sendin healing vibe you moms way.