Fwiw, every time I have taken a flu shot, it has guaranteed 2/3 days of feeling horrible. That said, I don’t get the flu every year (iirc, I’ve had it twice in

Fwiw, every time I have taken a flu shot, it has guaranteed 2/3 days of feeling horrible. That said, I don’t get the flu every year (iirc, I’ve had it twice in the past 20 years).