I have had a stomach virus for four days now. diarrhea, vomiting, fever, body ache. how long should this last? i'm afraid to eat anything. lost 6lbs

See your physician: Most intestinal illness due to an infectious agent is self-limited. Viral infections such as the norovirus, which is most common and accounts for 90% of such illness due to virus, usually resolve within 3-4 days of onset of symptoms. If you are not improving other causes must be entertained and this requires a doctor to get a careful history and perform an exam. Until then drink plenty of fluids.