Dorvalla

I have the same thing, however, it's caused by me due to the so called "rollercoaster" effect. I can't play this game in first person. I had this ever since Wolfenstein (yea, the ms-dos version still) and there are other games that make me naucious whenever I play it. I switched over to 3rd person and I dont seem to experience it. Maybe that helps. Switch between first and 3rd person.