KG, really rushed but... Just wanted to let you know how much it helps to hear that others have interactions like this.
I know just what you mean when you say:
"It is during interactions like this that I question everything, even my sanity. It's crazy-making. The fight continued last night. I was so bad, the grief was too much and I said many things, way too many..."
Round and round and round we go. There seems to be NO POINT trying to discuss things... but then, often H will come back with an apology a day or two later. So maybe something does get through - who knows.
What I am sure about is how much it helps to hear the detail of such conversations from someone else - makes me realise that I'm not going crazy in this.
Mind you, I find it mind-boggling that our H's spout the same sort of stuff - almost verbatim.