I got H1N1 when it was the disease du jour. DH and I got it together from a patient who thought they had a cold...nope, it was the swine flu. I would have had to die to feel better. We missed over a week at the office. I know what you mean about being afraid to go to sleep for fear of drowning in your own juices. I was there.I've never gotten the flu shot but I had never gotten the flu until last year. (in 30's)
This Jan I was sick for two months with first Covid and then the flu. It was like they fed off each other and the flu wouldn't clear up.
We experienced Covid twice before the vaccine and twice after, the shot made it bearable. And I still remember being afraid to fall asleep for fear of choking on my own fluids. So every year for me.
Now this month I'm going to get the flu shot. It never made a lot of sense to me as a less effective vaccine, however my Doc tells me it's really gotten better in recent years - provided we waited until October - and I do trust her, she's extremely competent.
The Flu vaccine was so ineffective for me that the doctor told me to take two, One in November then one in February. That's when I quit and decided to become a hermit.