I get it in first person shooters - tried doom long time ago and was nauseous for hours after, never had the problem in Air warrior or AH.
B-In-Law is an optometrist, he also said to check for astigmatisms, and to put a downer to you, it is also a a precursor to epilepsy. There are many cases of people having epileptic seizures playing video games.
NwBie