Sorry you're not feeling well.
I occasionally get tummy trouble during AF, but it's usually out the other end and coupled with intense cramps, so I'm concerned that maybe yours is a tummy bug in addition to AF. There are tummy bugs of every stripe going around the area, so you might be struck with one.
You have my sympathy - my first PP AF also coincided with a tummy bug that DD had brought home from school. It was THE WORST.
Anyway, right now I'd focus on staying hydrated. I find that a heating pad generally helps with cramps, but it will make nausea & vomiting worse for me. (See above about 1st PP AF and tummy bug. Ugh.)
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Liz
DD (3/2010)
"Make mistakes! Get messy!" - Miss Frizzle