Thank you for your query on Healthcare Magic.
Your child seems to have a viral gastritis
But some times mesenteric lymphnode infection also cause fever with stomach pain.
Give Tylenol in prescribed dosage for fever.
Give plenty of oral fluids to maintain dehydration
Consult your Pediatrician
to examine the abdomen to look for any tenderness and for basic investigations like CUE, ultrasound
abdomen to rule out any infection.
Hope I have answered your query.