Do hope IsI have put as much effort into improving physics as they have eye candy, they'd be stupid to ignore what was probrably the main complaint about the original rFactor.
I'd at least like to see manufacturers being free to chose the engine configuration, teams chosing to build cars to take advantage of the merits of different engine layouts could help create better racing, the rules have narrowed things down to the point where cars are too similarly matched over an entire lap to promote good racing, and it looks like thats set to continue.
Petrol/oil/exhaust fumes might contribute too, I had this problem when testing a car with a leaky exhaust and badly sealed passenger compartment, felt like throwing up after a while in the car.
Motion sickness sounds most plausible, although I've never known a driver to get it, and I don't get why you'd suddenly get motion sickness even though you've been racing/driving for quite a long time I presume?
Nothing worse than a phantom shitter, we had one in halls lay a cheeky turd on a mate's kitchen floor a month or so ago. Its amazing to think that even by that age some people still haven't passed toilet training.
Put it all into perspective with reality and you'll realise just how sad crying over a lack of development is, this is a racing simulator, not the death of a loved one.