Combo of ADHD/misophonia. There's a lot of crossover with all of those divergences and autism, but having misophonia doesn't make you autistic.

I have both and experience sensory issues differently. The autistic sensory issues are definitely more significant and impactful. Like my brain just cannot process things once it gets overwhelmed, sometimes it's painful and feels like my head is going to burst. ADHD sensory issues are more attention based, so I don't get overwhelmed in the same way, just frustrated and less able to control my executive function. I can also get hyperfixated on a specific thing, whereas with autism it just becomes all one big overwhelming stream of data that I can't process.

Nah, solidly a feature of either/both.

... Because it can't happen to people that have either of those disorders and only one of those disorders can cause sensory issues. ADHD is a spectrum with a broad list of symptoms and not just "haha, my lil stupid brain can't concentrate" disorder.