I'm really sorry for your bad experience with COVID. I can only imagine how bad it must have felt.
Having said that, the science has been clear on robust, long-lasting immunity eg.
https://www.nytimes.com/2020/11/17/health/coronavirus-immunity.html
True re-infections are exceedingly rare, and usually mild or asymptomatic. It might not be an exaggeration to say that it's more possible for you to die from a piano falling on your head, than getting re-infected. It's too bad fear-mongering garbage mainstream media have made people believe otherwise.
You have immunity dude, go out and enjoy it, and let the rest of us deal with the risk-taking.
And by the time it might wear-off, you'll boost it with a vaccine. Science is beautiful. And by science I mean the real one, not CNN or Foxnews.