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Flu is a respiratory illness with high fever, coughing, aches and pains all over. It doesn't usually involve digestive symptoms.
What you are describing sounds more like viral gastroenteritis. Usually it lasts anywhere from 24 hours to 5-6 days and the body clears it on its own. It isn't necessary to eat for 2-3 days, but do try to sip broth, water, Gatorade, etc. - just a sip every few minutes usually prevents it from triggering a reflex to vomit it back up like a whole glassful of liquid might. When you are able to eat, try to add applesauce, bananas, boiled white rice or white potato, and plain toast just a little at a time. Sipping small amounts will be enough to keep you hydrated.
Please let me know what additional questions you have about this.