hmm.. that would really suck to get sick from playing fps games such as hl2 and ut etc.. i feel sorry for you guys

the only one time that i ever did get a head ache or get sick was when i was watcing my friend play a map in unreal tournament.. worst thing i have ever seen in my life :| the colors of everything changed depending on the angle you were viewing it at, and the colors ranged from bright bright yellow to bright orange, green or some other intense color... then there were smiley faces everywhere.. lol, but i had a headache after just watching him play for about 10 mins, and it didnt wear away for about an hour

btw: Hultent3.. take a look at halo 2.. if thats not over rated, half life 2 is nothing.