One of my 2 doctors warns against getting a flu shot. He was happy to hear that I don’t get them. My last one was about 15 years ago. I have bad allergic reactions to the shot that got worse every shot. My last and final one caused my arm to swell up for about a week with a knot about the size of a half pin pong ball. The knot gets really hot and is very painful. Not a normal pain like a tetanus shot or a hard punch in the arm. It’s more like a branding.
BTW - I did get the flu once since then. I missed 11 days of work. I would still rather have the flu than the shot.