Hi, Thanks for posting your query. With the available described details, there appears to high possibility of Acute viral gastroenteritis. You should consult with internal medicine specialist/ gastroenterologist/ pediatrician and should go for thorough check up. You and your child should go for complete blood count, erythrocyte sedimentation rate, ultrasound imaging, and serum electrolytes, renal function test. You and your child should take antispasmodics, probiotics, antipyretics, if needed, under guidance of your treating doctor. Frequent watery diarrhea and vomiting may cause weakness due to loss potassium. Take soft diet along with yogurt and banana. Avoid milk and all milk related products. Take care, Dr. Mayank Bhargava