S.B.
As long as he's playing okay and things are fine except his tummy, he's likely going to be fine. Don't worry about him not eating much. He will when he feels better.
Try applesauce and toast. He might even like the applesauce ON his toast.
Don't give anything with fats, like butter.
My kids loved cream of wheat when their tummies were upset...with a little brown sugar.
They had no wheat allergies.
It's warm, soothing and they did fine with it.
He'll be back to himself soon, Mom.
Hang in there!