I have to admit I got the flu as well, despite taking the flu vaccine. It's kicking my azz, now on day 4, at least the severe headaches have subsided, but there are other symptoms right in line to make sure the misery index doesn't drop that much. This flu is going to push many elderly to their physical limits and will cause many deaths, it's that bad.
I had telly health appointments scheduled w/in 24 hours and then 36 hours after onset of symptoms, but cancelled both because I thought it was "just a cold" well, those 2 decisions have cost me much suffering and will result in a longer, slower recovery.
Treatment is available if c19(Paxlovid) and the flu(Tamiflu) are confirmed early so having the tests on hand is essential. If one shops AMZN carefully you can buy the 3-1 tests for as little as US$7.00 each. I just bought a couple because winter is just starting and the height of tourist season is upon us. I believe it's essential for those that live alone and are already feeble to get and use these tests as soon as you feel that scratchy throat, or whatever your personal first indication of cold symptoms are.
Everybody knows how to avoid airborne infections so I'll stop here.