A friends mother died from taking a flu shot but I have known more people who died from having the flu and then it turns into a bacterial infection. The flu, which I have not had since I started taking the flu shot, ALWAYS ended up being a bacterial infection for me.
Have your vitamin D3 tested.
I’ve never gotten the flu, never gotten a flu shot but always had head colds (and allergies) turn into pneumonia.
But not since I started taking the d3.