I've had the flu twice in the past 6 weeks, it was terrible. What I felt worked was citrus tea with half a lemon squeezed in, 1 tbs of raw honey, and a couple shakes of Turmeric. Took that twice a day for the first two days and was feeling better on day 3 (both times)

I have 2-3 friends that also swear on the onions in your socks when you sleep, but no personal experience there.