I had a mild attack a few years ago. Ironically it started in a hotel in Chicago when I was returning to the UK after checking out flying schools for Ab Initio training and I had to postpone my appointment for the initial class 1 medical.
Fortunately it never really got beyond a slightly dizzy / nauseous phase. I also found that bright lights were just a bit "too bright" and this seemed to increase the feeling of nausea. My GP diagnosed a inner ear infection and prescribed Stemetil tablets. It cleared up in about 10 days so I guess it was BPV and not labrynthitus. Should have asked more questions.
When I finally made it to the AME he made me do a lot of balance stuff (on one leg / eyes closed / tip of finger to nose etc) got the medical ok.