We have found the best way to treat Nausea and Diarrhea in our children is to institute the BRAT (Bananas, Rice, Applesauce, toast) Diet until symptoms subside. Following this plan usually helps their tummies.
For Diarrhea i have used immodium for children on my 8 and 10 year old and they said it REALLY helps!
But still the BRAT diet is still the best bet in my book!
i have also heard of the CRAM diet (cereal, rice, apple sauce, and milk) because it contains needed proteins... but have yet to try this one... which do you prefer?