Have you tried taking some of those motion sickness tablets? I don’t know if they work entirely but they certainly helped lessen the car sickness I used to get as a child. Although they do take a bit of time to kick in.

I don’t get motion sickness anymore luckily, unless I try to read while traveling.
Never got it from video games. It’s weird apparently it can get pretty specific for some people, like right down to a particular game engine.

That seems to be the case for me, which is how I end up wasting a lot of money on games I can't play. I love RPGs so will generally try them when I can - some make me sick, and some don't. The ones that do will generally give me problems within a couple of minutes of playing, and the ones I'm fine with I can play for days (first person games are different - they all make me sick the second I start playing, so I don't even try anymore).

I'll try the pills, ginger ale and other things mentioned here and will let those of you who are interested know if any of it helps. :)

I never got this with Goldeneye but I got it later with Timesplitters on the playstation. Maybe it was the way we only played Goldeneye in multiplayer so it was a wide field of view (2-player split-screen) or a small screen (4-player split)
I read somewhere that the framerate affected it too.
Mostly it's just FPS that does it to me and maybe a low-angle 3rd-person camera if it's turning a lot. (like over-the-shoulder in The Witcher) (Though racing games I have no problem with).

I'll second the ginger suggestion - you can get some fresh-ginger, slice it thinly, add boiling water and sugar (NB: adding salt to this mixture also makes a good hangover / general nausea cure)(and is good for restoring you if you sweat too much on a very hot day) *quaffs ginger potion of extra-healing*

Another thing that works for me with actual motion-sickness is a special oil you can get here in China but it basically smells like Vicks / menthol-oil - try rubbing that on your chest / tummy before playing and breathe deeply.
Edit: This is the stuff I mean:
http://www.axebrand.com.sg/product.html
from the site:
Axe Brand Universal Oil, with its blend of eucalyptus, menthol, camphor and other essential oils, has known the value of natural therapy for over 70 years.

Audiosurf
I honestly think this game should be called "How long can you play it before you throw up".
It didn't happen to me but I felt not-so-good after some hours of playing the demo, I'm not sure if it's because of the constantly changing colors, or because of the acid techno I put up there as a music, but I do not recommend this game to people who can get physically sick from playing some games.

You know, I've always been disappointed with myself for being such a lightweight when it comes to fairground / theme park rides, those things make me ILL
I'm glad my gaming isn't affected though, I'll remember that some of you have this from Doom next time I get it from Nemesis!
I heard Heston Bloomingfeld say once that its similar to when you eat something poisonous and it makes your head spin and your body knows that the information from your inner ear and your eyes isn't consistant, it decided you must have eaten something poisonous and decides it should void your stomach!

IIRC he just advocated building up resistance and getting your body used to it gradually - you really shouldn't play until you throw up then push yourself to play some more but play a bit and stop when you still feel fine then see if you can play for a little longer and still feel fine, like building up muscle or excerscise or soemthing!

With the fairground thing I wonder if I would do better with corrected sight - I'm not wearing my glasses on the things in case they fly off and I can't afford contacts but I wonder if I did if I would get sick less - Is your eyesight recently checked?

Yep, no issue with my eyes. The problem with starting and stopping is that it's such a short time before I get sick. With FPS games in particular, it only takes a minute or two to feel sick, and about 10 minutes to physically throw up.

Oddly enough, roller coasters etc are all fine, it's only "on screen motion" that seems to trigger it.

This has messed up many games for me. NOLF 1, 2, Half-life, and old DOS FPSes, as well as some first-person RPGs (to a much lesser extent) come to mind. Certain games tend to get better when I come back to them after a little bit of playing per day, while others just make me sick after 30 min. and I retain no interest in the game whatsoever.
Setting mouse sensitivity or actual dpi lower sometimes makes things better.

I tell ya, it almost got very interesting a few times. As in 'grab a mop and bucket' interesting. We'd be running along the halls shooting demons and then, like someone snapped their fingers, "Uhh, youbettertakeoverlikerightnow!"

I've found ginger gum very useful on uneven train rides.

Really? That might help me tremendously since i have problem with equilibrium.

Oh man, I feel so lucky. I have an extremely high tolerance towards motion sickness. The only time I was sick was when I was young and we were on a yacht at sea. But that was more of a sensation than full on sickness. When I went to the hospital for the physical examination for the volunteer army training, they said I aced the test in regards to inner ear disturbance (they run hot and cold water and watch for eye movement. I guess the problem here are the genes, you are either fine with it or not.
As for a cure, I wanted to give a few ideas that I think might work, but they were all already posted. Try playing with only one eye? No, that's silly, but I'm curious if it would actually help... Perhaps a smaller monitor?

I got sick once watching a friend play Quake. Doesn't happen too often with games though, especially not when I'm the one "driving". But in real life I get it frequently when I'm a passenger in a car or on the bus ...

MonstaMunch, are you also susceptible to flashing lights?
In that case, you should have yourself tested for possible epilepsy.
I had one massive epileptic episode once when I was playing too long without rest. A great game like Warlords 2 can do that to you... <= GoG, can you take a hint?
I´m thankfully not susceptible to flashing lights or pop-art patterns.

I've only ever gotten sick playing a game twice, and both times it was with Return to Castle Wolfenstein. I have no idea why. I've played the game many times, but the last two times I tried to play it, my head started feeling weird and I had to get up and do something else. Maybe I was running around too fast or something.