The flu-like symptoms I had lasted only about 24 hours and I am back. When I feel sick, which fortunately rarely happens, what I do is take to bed and sleep as much as I can, my only sustenance being dilute sweetened orange juice (50% juice, 50% water, plus four tablespoons of sugar for a liter of the mixture). That is the only thing that I can take that overcomes the deadened taste buds that flu causes. I avoid any medication unless the symptoms are really severe.
Like most home remedies, I doubt that this strategy has any beneficial effect. The duration of the flu and its severity is driven largely by the nature of the virus. But I must say that doing nothing in bed for a day, not reading or watching anything or surfing the web, can be quite relaxing. It sort of clears the mind. I have never been to a spa but imagine that the experience must be similar.
The one odd feature is that since I am slipping in and out of sleep every couple of hours, I have a lot of dreams, or at least remember a lot of my dreams, and some of them are really weird. Not frightening weird, just absurd weird, like the one where we had moved into a new house in a new neighborhood and my main concern was to find out the day when the trash pick up was and whether I had to separate the recyclables. I wonder what Freud would have made of that.