I'm same as you OP and with children, recently diagnosed AuDHD. As for symptoms, my whole life is a symptom, everything. And, it would take pages to explain.... In saying that, a few majors include hyper fixated on one thing eg a food, song, tv show, sport, item of clothing, celebrity, hair product, vitamin... Becomes an obsession. Always feel rejected, quilty, hurt, like everybody hates me and thinks I'm an idiot. Can't read anything short of a mumsnet post, as a sentence has to be read ten times over before it sinks in. Always mentally exhausted especially after a social occasion. Impatient and snappy. Can't sit still but can't do anything either like a paralysis where the brain is so overwhelmed I get nowhere. Brain on overdrive, always. Can't just do something eg coffee with a friend eg no, not tomorrow, in two weeks we can schedule it in, as I am extremely inflexible in how I behave and think. And I plan, ruminate, rehearse conversations, stress, until it happens... which it usually doesn't as I cancel because of the distress. Distressed is a good word to describe my brain. All sorts of weird stimming shit too. It's relentless and I sound like hard work lol.
No meds have ever worked, eight to date, so I'm going it alone. But in all that crap comes more understanding and empahty for myself and I'm very lucky in so many ways. Outwardly you would never expect it in me because I present as entirely NT. And so I expect no favours or special treatment and life is, believe it or not, really good, outside of this chaos in my head. Xx