Wrote my first programs for this too, at 7. Copied from the manual with no understanding but eventually writing my own. The only coder in the house! Didn't write anything decent until the C64 when I made a few small games.
Sadly I'm in the same boat, for years now. Fatigue is such an inadequate term. Can't even sit up for long without getting exhausted. Still trying treatments but to no avail so far. The impact of Long Covid seems to be drawing a lot of eyeballs to this though so I'm hopeful something will be found.
It's taught me patience and empathy. I used to teach others how to program and when people couldn't get something I presumed they weren't trying hard enough. I get it now. Now I read the requirements or exercise or puzzle or whatever and there's just nothing where once there was a bubbling and filtering of ideas or whatever we call thinking.
A lesson learned from hard experience and unfortunately too late: get your own illness benefit insurance. If you have it through your employer you can't sue the insurance company since you're not a party to the contract. They don't even need to talk to you, only your employer.
Great memories of Parsec too.