What's wrong with my baby!!?? Please help

So this has been going on since Thursday.. FTM by the way. My toddler of 1 year and 5 months has had constant diarrhea! It's only really bad (like explosive diarrhea goes everywhere!) when she finally takes a couple bites to eat and on top of that when she finally takes a couple bites at night she's throwing up and won't sleep. The rest of the days she just has mild diarrhea and won't eat anything! Maybe a little bite of a cookie but that's it I'm worried sick and every time I need her pediatrician she's AND her medical assistant are out for the day I can never get ahold of her. She has no fever she seems perfectly normal running around for a bit so idk what to do???? Should I just take her in to the children's hospital?