Thank you for your query,
At present your child is having Gastroenteritis
mostly of a viral one.
Hydrate him properly with oral rehydrating solutions. For fever you can give Tylenol
in prescribed dosage.
The paleness of your child may be due anemia and better go for his hemoglobin
check up.Some children with anemia may have low appetite.
Consult your Pediatrician
for further evaluation and management.
Hope i have answered your queris.