How long does stomach flu last?been 3 days it feels like i have a huge knot in my stomach.im hypoglycemic.hardly can eat crackers without pain.

Gastroenteritis: According to the cdc, viral gastroenteritis usually has a duration of one to ten days (depending on the specific virus). Start with clear liquid like water, soda that is clear, or sports hydration drinks. Sip, sip, sip. Work up to solids with bland foods like bananas, rice, applesauce, toast, gelatin, or chicken. Avoid alcohol, nicotine, caffeine, dairy ; high fat foods. Rest.