I'm sorry you had that experience, as well. It leaves a permanent trauma scar that's very difficult from people to genuinely move on from.

If you're not fmiliar with it already, you might be interested in the work of Dr. Elaine Aron, on High Sensitivity and sensory processing sensitivity (SPS) as a genetic trait: https://hsperson.com/

Disclosure: She also happens to be a friend, from "way back;" we first connected over this topic in 1997.

I have the same issue with "slowness" and I was pointed to this next thing... before it was really a thing. You might find it informative, as well: https://en.wikipedia.org/wiki/Cognitive_disengagement_syndrome

I generally reject all this as a "diagnosis" and instead focus on it as an explanation and background for some of what I am experiencing.