Biggles, I get sick too when I'm up there, so I came to the forums for a little advice. Calcapt was kind enough to impart some wisdom and I am sure he won't mind me sharing them. He suggested the consumption of a little ginger prior to flying. He didn't say what form of ginger (pill, raw, sauteed, pickled), but said it works somehow. And since I like to look down at the instruments, he suggested I look at the horizon instead. I guess I should also stop checking to see if the wheel is still there.
Another pilot friend suggested, as rickair did, to eat a little something, but nothing greasy. I also found going to the bathroom first helps because, at least with me, just the thought of not being able to go made me sick.
Someone else suggested acupuncture, but I've never tried it myself. You go first.