Depending on your card you could try dialling down the graphics settings. It won't look as good but moving around will be smoother/less juddery. Tim Willits at the recent Eurogamer devs speech said that with Rage running at 60hz rather than current games at 30hz, it was helping people who were normally prone to motion-sickness during gaming. Pro quake players will often break the graphics down to their basic colours, not just to get rid of the eye candy so the enemy stands out better, but also to increase the FPS to improve accuracy.
Also if you play in the dark with the only light sorce being your monitor, try putting on a low ambient light behind your monitor. Grab a drink/take a leak/check emails etc every half hour or so, it's amazing how this kinda 'purges the mind'.
edit: Also a big thumbs up for the FOV change. Low FOV is a trick done by developers to force a reduction in the number of polygons needing to be displayed by the graphics card so seeming to make it smoother. The trouble is, it's then like playing through binoculars. Can you imagine trying to play footbal with binolulars on? Actually I did see this once on a Japanese game show and it was hilarious, with players trying to kick the ball when they were 6-feet away from it. Dead Space is a good example of a low FOV.