i chew gum on all my flights. dont know why...i guess it has been preemptive action. havent been nauseated ever.

or you could try ginger capsules. i tried some of that when i was doing unusual attitude stuff (cause i feared choking on the gum)...but the ginger did nothing, so i went back to gum and made it through...without turning blue.

trial and error...i think thats all it is...