Wow is your sit different from mine. So much communicating and so many interactions. You're really strong for being able to put up with H's behavior.
I struggled a lot with turning my brain off early in my situation. It would just. Not. Stop. It was like a problem solving machine that had been uber-hyped up. It was as if I thought that if i thought hard enough or long enough, eventually i would come to a solution.
Of course that did not work. I ended up not sleeping, not eating, and generally feeling the most miserable i had in my life.
I finally realized i had to stop.
So now when the spinning starts - i imagine a giant red STOP sign. Then, these are some of the phrases i repeat to myself:
"You have been over this a thousand times." "You cannot use logic if someone is being illogical." "How does this thinking help me? Am i feeling better now?"