Have you tried playing as a different class than rogue? I ask because I played through as a mage first and didn't have any problems with motion sickness probably because I was observing from a ranged position, but then switched to the more close up rogue fighting and I started to feel queasy myself.

(This is why I can't do first person shooters or play anything that doesn't let me back off from my character's pov a bit. I get so damned motionsick. Ugh.)