I had a very serious diarrhea after I came back from a friend wedding lunch; on the same day my husband brought me to visit a doctor and he told me this could be food poisoning. On the third day, my diarrhea stop, but I am still feeling cold and weak, today, it is the 4th day, my diarrhea coming back :(, so I visited my company panel doctor, she diagnose me as stomach flu. I had been heard people complain they have "stomach flu” and today it is the first time it happened on me. Doctor normally use the term gastroenteritis, which means irritated and inflamed stomach and intestines (the gastrointestinal tract) and may be any number of things, including bacteria or viruses. Usually, gastroenteritis is caused by bacteria, viruses, or parasites, which can spread quickly through contaminated food or water. Bacteria that cause gastroenteritis include Escherichia coli. Salmonella, Campylobacter, and Shigella. These bacteria are usually found in food, but can be spread person to pe...