I have this problem on some games, and it's almost always FOV related. It's not so much motion sickness as just a blistering headache but it will usually lead to me getting sick to my stomach if I keep trying to play. Sanctum 2 completely destroyed me and my friends no matter what FoV I use, and some games like Half Life 2 are the same. I don't really have any advice besides try to make the FOV higher but on some games I just can't play them
Matthew 7:21 http://img15.imageshack.us/img15/2492/gyenyame.jpg
Well its a good thing I have the PC versions of these games where the FOV can be adjusted on the console. I also hear people having trouble with HL2 and Portal which I am planning to get once they go on the steam sales.
Not to hijack topic but what's the best way to play through New Vegas? Like what mods should you have for a fresh playthrough? I messed up my previous game with adding bad mods that kinda ruined things for me.