(i am not a dr!!)
i would say make sure your keep your fluids up, and continue to eat healthily, if your bug goes on for more than 24 hours, then maybe see your gp
if you are vomoting/diahoreaa (i have NO IDEA how to spell that - but you know what i mean) this is especially important.
eat what you feel you want to be eating, as you will be unlikely to feel like eating crappy food - if you want to eat starchy carby food - then your body is telling you that thats what it needs. listen to your body