Shout out to the person who suggested getting your hearing checked!
A month or two ago, someone posted on this sub about getting their hearing checked and finding out that they had hearing loss - it wasn't just their ADHD brain preventing them from concentrating on speech. I recently got new medical insurance that covers hearing tests so I figured what the heck, I have nothing to lose.
Turns out that there are certain tones and frequencies that, due to a genetic issue, I've never been able to hear! I never clocked hearing "loss" because I never had the ability to hear those tones in the first place. I got hearing aids and it's made such a difference!
That's not to say I don't still take a few seconds to switch my attention from whatever I'm doing/thinking about/concentrating on to the person speaking to me, but I at least hear them the first time they speak.