well, i guess u just need to get used to it... i started playing wolfenstein 3d in 1994, (and boy was it fun!!!) then came doom (boy was the funner!!!) then came doom 2, then quake 1 (boy... did that run slow on my 133 mhz comp!!!) then came quake 2, (boy was the SOOO fun, provided me hours and days and weeks of mad FUN!!! with my voodoo 3), then came UT, then came cs, (boy did walk so SLOW!!! when i first played it)
so ya... the only times i got motion sick was when i played cs, really, 'not enough motion' sickness.... after playing UT and quake 2 fer long hours, u get to running REAL fast, and playing cs for long hours... u just get bored and sick and u just feel kinda funny inside....