I was only ever observed to have autism, but I highly suspect that I'm audhd. What kind of hell is this where caffeine can help my ADHD focus but harms my autistic focus

For me it doesn't make me feel awake, only incapable of sleeping. Which is hell, like being thirsty and not being able to drink

Depends on use case - I find it helps a lot with things like competitive video games.

I seem to have developed some kind of ADHD in adulthood, while also avoiding caffeine in recent years. Now, if I drink two cups of coffee, I come to four fours later with fifty new tabs in the browser, the system deeply in swap, two new projects started and abandoned, and nothing actually done. If I'm lucky, some system reconfiguration that I've been putting off for months, will finally be made.