 [ Symptoms ] i broke my left clavicle in a mountain biking accident about 3 years ago [ Disease ] i have to tell you that the stomach flu is not influenza influenza is a respiratory disease not a gastrointestinal disease so tamiflu will not help as you have experienced tamiflu only works for influenza not other viral infections what you most likely had was viral gastroenteritis   a viral infection that is unrelated to true influenza viral gastroenteritis is a self limiting disease lasting about a week i am assuming that you did not have a nasal swab rapid flu test to diagnose your illness unless you actually had a flu vaccine to prevent influenza you would still be considered at risk for getting the true influenza it is not too late to get a vaccine but it will not help you for about two weeks keep that in mind when you are exposed to large groups of people