Thanks for posting that you don't get the flu shots. I never have gotten one, because I've never had the flu.
Now that my immune system seems to be in some kind of rebellion (the recent onset of asthma in my 50s), I thought I probably should get flu shots. Then I thought twice about it and have decided against it again. I just know it would do me more harm than good, and no need to fix something that isn't broken.
OTOH, I did have whooping cough this year and it is rough. Six weeks of barking constantly, never stopping, totally involuntary. It happened when I cut back on my antihistamines for a couple of weeks, due to poverty. I later found out that our many-years-old DPT vaccines *do* wear out, as mine must have.
And then there's the shellfish thing! I've eaten any and all shellfish daily, weekly, all my life. I made some linguini with white clam sauce a few months ago and one whole side of my face swelled up--really badly. I told myself it was the canned clams and probably just that one batch--though I ended up throwing out all the rest of the sauce I made. Now I'm scared of canned clams. Have eaten many more types of other fresh or frozen shellfish since then, but still scared to try clams, at least canned ones.
My husband went through a siege of being sensitive to shell fish, we stayed away from it for over a year and then he ate it again and didn't have a problem with it. Go figure.
Whenever I've have not gotten the flu shot, I get the flu badly. I have three young kids, and it's hard to take care of them when I'm sick. My husband can't take off time from work to help, so I am miserable. One year I got it, and then my son got it the next week. My daughters who did get the flu shot didn't get sick.