Yeah, it's the body's way of trying evict the bug... and if you can eat something, there's a chance it'll help boost your strength to fight off the nasty bug... even if it's only a little bit at one time. Hydration is essential, tho. I'd never realized how many things in our body depend on our fluid levels - especially when we're ill and trying to get better - or things (even some meds) that can be thrown out of wack by not drinking enough.
If you're not feeling better by tonight, you might want to think about how you could get to the nearest clinic to find out if it's just the latest day-care bug... or something else. Usually these things only run 24 hrs then start to improve. I hear ya, that this might be a challenge even when you're feeling fine... just sayin'.