Sorry in advance this is rather preachy...but...
Therealme- you wrote:
"That means agreeing to all his demands and answering the phone to him. I would not dare tell him he can only ring between certain times while he has this hold over me, I have never been allowed to put any demands on him."
"His demands" is what this is all about. You are not the means for 'his demands' to be fulfilled, ever again. Normal people make requests, offer compromises, negotiate particulars to everyone's satisfaction.
Whenever your physical body feels a demand has been issued-and I expect you know what I'm talking about-your stomach turns and the tension tightenes up from head to toe as if you are on a torture rack...do not respond to him. Blank him. No-Nothing-Nada is all he gets.
What does your body feel like when the phone rings?
No, you do not need to pick up. You have control over that. You have been brought up to be considerate and answer the phone when ever it rings, as a reflex (I am this way, too).
But no! It is a choice. It is perfectly reasonable to set time frames for phones-friends have let it be known that they take calls between 9am and 8pm-don't expect an answer at any other time because they will not pick up. You do not need to "tell him" what your policy is, as someone earlier mentioned. You do not owe him an explanation for not being at his beck-and-call because you are in control of your life now.
It doesn't have to be set up as a strategy against xhN, but it is a part of the new framework for the life you want to lead now that you have complete control over it.
YOU DO NOT OWE HIM A DAMN THING!! Not plant, animal or mineral. Not physical, intellectual, emotional, or spiritual.
"You have never been allowed..." That is what a child would say, Therealme. Please get yourself out of that role.
TMSB stepping off her apple box...
He has upped the ante, and I know it is serious. But you do have logical explanations for your history. Print out MathAnxiety's guidelines and put them on your refrigerator. Follow them.
Take care, dh just walked in and well, what's for dinner?