This was a subject in the Flyer magazine a couple of months ago. The "Flying Doctor" so to speak gave all his advise and why air sickness occurs etc, only to be bombarded by letters in the following issue saying what a load of bolloks, so in the end the finally conclusion was you are just going to have to wait until you get used to it.
I myself find that some days I can wang the aircraft al over the shot and be totally fine, and then others where I feel a bit sick, but fortunately never have been yet.
So I dont know
really after all that
Good luck