Hi, Thanks for posting your query. Do you have acidic belching/ abdominal discomfort/ abdominal pain/ gargling sound in abdomen/ abdominal bloating after taking meals/ constipation? Do you have diarrhea or frequent urge to use washroom? With the available described details, there could also be possibility of acute bacterial gastroenteritis. Other possibility could be inflammatory bowel disease or some sort of growth. Light headedness could be due to fatigue or could be a prodromal symptom of viral infection. You should consult with internal medicine specialist/ gastroenterologist and should go for thorough check up. You should also go for complete blood count, stool routine microscopic examination including occult blood examination, and serum electrolytes, renal function test. You should take complete antibiotic therapy, antispasmodics, anti-emetic, probiotics, antipyretics, if needed. You should maintain your hydration status by taking potassium rich liquids. Frequent diarrhea/ vomiting may cause loss of potassium with weakness and fatigue feeling. Take soft diet along with yogurt and banana. Avoid milk and all milk related products. Take care, Dr. Mayank Bhargava