Poor baby. DD2 had bad gastro last year and we were told to expect it to be on and off for a couple of days or so, but so long as she could keep fluids down (we had to syringe 10ml water into her every 15 minutes at one point because any greater amount came straight back up) it will run its course and no need to worry. When she got hungry again we gave her something like grated green apple or plain toast but it took well over a week before she was normal again.

I usually end up in the shower with mine when they're vomiting because I always end up joining in with them. Green snot, fevers, rashes etc are sooooo much easier to deal with than vomit. I hope your DD's better soon, and the rest of you manage to miss out on it.