Hi, Thanks for posting your query. With the available described details, there appears to high possibility of Acute viral gastroenteritis. Other possibility could be inflammatory bowel disease i.e crohn s disease and ulcerative colitis. You should consult with internal medicine specialist/ gastroenterologist and should go for thorough check up. You should also go for complete blood count, blood sugar, serum electrolytes, widal test, amoebic antibodies and thyroid profile. You should also go for colonoscopy for better clarification. If ulcers has been found in large colon then biopsy is mandatory for exact diagnosis. You should take complete antibiotic therapy, antispasmodics, probiotics, antipyretics, if needed. You should maintain your hydration status by taking potassium rich liquids. Take soft diet along with yogurt and banana. Avoid milk and all milk related products. Take care, Dr. Mayank Bhargava