I had vertigo a couple of times too.

The first time I think was the true motion sickness kind- lasted 2 weeks and was gone. Took Dramamine but still had some problems at work with it.

The second time it hit me was a couple months into my RSI/TOS injury.
I think that time it was due to the TOS/vertebral artery symptom.

GLASSES-
I got new glasses at that time too and told them i didn't think progressives would work for me {dizziness} dr said it's all in the fitting and they had the best fitter around - nope dude was wrong!
i should have got my money back right a way-but they kept trying to adjust them and I never could wear them longer than 20 minutes at a time.
and forget trying to shop in a store looking up/down and all just made me sick to my stomach too.

The last couple of times I'm not sure what it was - just quick odd spells of dizziness and a couple of times a faster heart beat along with it {those times it would last about an hour}.
But had the full panel of blood tests and a physical - thyroid , blood sugar, vitamins, etc. all came back normal. only high cholesterol- which I knew of already.
But after the phys and blood work it went away too.
now just once in awhile I get a quick spell- like less than a minute.

chiro info links-
http://www.upcspine.com/self.htm
http://chiroweb.com/