I tried, all with varying degrees of effectiveness!

*eating a green apple (or part of one) before getting out of bed
* gingernut biscuits (ginger by itself, like the crystallised ginger, is also supposed to be good, but I hate the taste of it!)
* iceblock for breakfast (not very healthy I know but *TMI* easier to throw up than normal breakfast foods! LOL)
* eating as soon as I got out of bed, or just before I got out (sometimes it worked, sometimes it didn't)
* waiting a little while before eating, and just having half an arrowroot bikkie

There were probably some other things I tried, but it seems so long ago now I can't remember! Lol

Hope it goes away for you quickly, I know that for me every day was different, sometimes I was sick, sometimes not, sometimes I would just feel awful!