I don't game at all, but have watched, and I can totally see why FPS would set off vertigo!

I find it surprising, unpleasant and disturbing (in a sensory sense).that most FPS (etc) have/allow 'head movement' (point of view change?) that is so much faster than real body movement plus has a really unnatural acceleration/deceleration curve. Maybe you have to be trained to it from a young age, but to me it is jarring and not quite nauseating - but on the way. Maybe it's ok if you have totally normal eyesight and eye coordination (or wear glasses or lenses that do perfect correction).