Yikes, more and more efforts to combat the flu seem to be marginal or counter-productive. Too bad we can't just stay home and quarantine ourselves when we feel like death...
Even working on the farm, I rarely could take a sick day. Cows won't milk themselves and you can't tell them to hold it for a few days either.
I don't mean that people should take a few days off, they should, but that may not be possible, I mean that you'll have a period where you're not capable of more than basic tasks.
It was too late to go the doctor, and I only had Vitamin C (as Sodium Ascorbate powder) on hand, so I chugged that down, up to maybe 5 grams every half-hour in orange juice, and about 6 hours later, the worst of the flu was gone. Next morning, I was feeling like I only had a minor cold. The flu never came back, either.
Since then, that's been my go-to strategy.