Not much really. But I tend to have a cast iron stomach and don't usually get stuff like gastro.

I just let it all go - telly, dvd's, jarmies, take away no housework until I can get my sorry butt back off the couch. I let the kids sleep in my bed too and that usually helps
If I'm sick with something yukky I wouldn't call anyone unless I was literally dying because I wouldn't would them to catch it and 99% of my friends have kids and it's the last thing anyone needs!
Hope your tummy stays strong.