We went through this a couple weeks ago. My 13 month old daughter had 2-3 days of diarrhea but no vomiting, fever, etc. She seemed to be acting fine. We put her on the brat diet (banana, rice, applesauce, toast), no cow's milk. I noticed she had a molar coming in and thought it might just be that, but then I got sick too, with vomiting and diarrhea. Now I hear there is some sort of stomach bug going around. We called her doctor after the first couple of days and he said we could also give her yogurt (for all of its good bacteria). She likes water but she didn't like the grape flavored Pedialyte. And thankfully I had a bunch of frozen breast milk which we used to make sure she stayed hydrated and fed. (She quickly got bored of the simplified diet.) The Dr said we only needed to bring her in if she had blood in her stool, high fever and/or if she became lethargic. It took more than a week to reestablish her regular diet (and mine). For the rash, have you tried Aquaphor? I know it sucks and it hurts to think of them in pain. Good luck and feel better.