Flu is impossible to get if you take zinc, vitamins C and D daily (D can be replaced by sunbathing daily 7 minutes each naked side in strong sun), don't kiss a sick person nonstop for longer than 15 minutes, and don't get your neck cold in low temperatures or wind.
Since you already have it, these vitamins and minerals will help to cure, but don't sunbathe, take D. And it will not cure overnight. You might still need ibuprofen to control body temperature if it goes close to 39 celcius.