As Jo mentioned... the ADHD thing means if I'm not super careful I absorb absolutely everything from everyone around M.. It's part of the social disconnect that happens with ADHD... we're 'reading' what people are really feeling, regardless of what they're saying. The gut response is to respond in kind / take on other people's stuff.
That's part of my cardinal rule of 'never get emotionally invested in an argument with a child'. Having an ADHD kiddo... he'd react to my emotions by mirroring them. So if he's losing it, and then I get upset, he would get even more upset. But if I stay calm, his gut response is to calm down (which ticks him off, because in full flail he doesn't WANT to calm down).
It's a thousand tiny, MINUTE, body and facial expressions. In the face, they're called 'microexpressions' (and last for typically 1/5th of a second)... but the body has accompanying ones. J. as an example; disgust on the face, pair with a tiny movement of the sternum = self loathing... even when someone is outwardly smiling and 'happy'. Pair it with a fractional shoulder movement, though and it's not self loathing, but reviling another person.
One of my psych profs thinks I'm super fun, because she can show M. a short clip of a video... and I can tell her a story of what's going on with someone... and then she plays the video some more, and yep. It totally plays out J. like I said, or she brings up the case file from a year or two later. In microexpression parlance, it's called being "a natural".
Most ADHD people I know are, and apparently, most abused kids learn that same kind of hyperfocus in order to predict in dangerous situations. ((I was never abused, for the record)).
I could NEVER do clinical psych work. Being around people, and sifting sorting what they're actually feeling with what they're trying to project (and a hundred different kinds of trauma/ etc.) is EXHAUSTING. The sifting and sorting is, socially, having to remember what they're TRYING to project versus what I actually know is a pain in the tucus. It takes a LOT of energy to ignore people and block them out, because my body responds to what they're not saying.
Before I learned to block people out / aka not actually look at them, I was a hot mess. Even still, the most RELAXING people to be around are either high energy sorts, other ADHD people, and Aspies (who, in GENERAL, are pure honesty. They say exactly what they're thinking and feeling, so there isn't the mental exhaustion of trying to block out what their bodies and faces are screaming in order to hear what their mouth is saying).
So not true empathy, although a lot of people who don't know better, think I am. Nope. J. very, irritatingly, observant.