Is there anyone you can call to come over babe? I've relied on my uncle to care for Bailey (he'd never looked after him solo before) when I was sick a few months back. He did far better with him that I expected. If there is no one..... set up camp with the kids in the lounge room, get the kids DVDs out, and try to relax on the couch as much as possible.
You're DD is pretty cluey, let her know you are sick and she needs to help and be the Mummy today, she can help you, she will probably enjoy it

Massive Hugs to you x