It's complicated, I suppose. I don't feel like I've ever 'lost myself' to him - it's all tiring and upsetting and demoralising, yes, but I don't feel trampled down or diminished by him. I think, fortunately for me (and maybe him) I have a pretty cast-iron self belief and sense of esteem that nothing he's said or done has made me doubt myself as a person. I think I can self reflect on my behaviour and be fairly honest about when I've done the wrong thing, but I don't torture myself about it or let it define me.
He knows how things have impacted me and I will keep telling him - I think one difficulty is that he needs to appreciate the difference between me learning to 'handle him' having come to him as an adult, and the effect on the kids, whose lives he's always been in. I used to flinch and cower (which he also hated and made him angry) when he seemed the slightest bit testy. I still feel churning inside in those situations, I don't let it show outside because I do know he won't always go downhill and most likely it will pass, and that he will likely go downhill if I express alarm before anything has actually happened. But I don't think he can expect that of teenage kids.
His response is partially the ADHD dysregulation, and he's realised, partly that as a kid, his mum would very quickly jump in response to any raised emotion with to 'Are you angry? Why are you angry?' which (understandably) upset him and wound him up more.