Don't be too hard on yourself.
You haven't shredded anything love, nothing at all. You know, in your rational moments, that he has caused all of this. You've had to react to the fallout and it's shit.
What you are going through now is a stage, it's like the bereavement process, you get angry, (I was furious with sis for dying before my big birthday - how dare she). Then I was in despair because she wasn't there. I liken what you feel to how I feel about her. Luckily, I work with counsellors and I know that all the feelings I have, the anger, the despair, the loneliness, the sheer unbelievability of it all, is all natural, and part of grieving.
You're grieving. Sometimes (today and for the last few days) you've hit rock bottom. It's all too much and you want it to go away, to it never to have happened.
Go with the flow Wisey - but you know this will pass. Because you know your ex better than he knows himself, you also can see the huge mistake he's made. I can also see this with my ex. But we have to let go, and put ourselves first. And it is hard. Because we've been the one for so many years to protect them, and nuture them and now we have to step back.
You say that he would talk if you wanted to. You also know that it wouldn't help anything. It would just make your recovery slower.
Go see the GP if you think it will help. (Sticks mental health nurse hat on) it may well help you to get an AD - Citalopram is good - a low dose, say 20mg, will help you to detach from your emotions a little, without dulling your ability to carry on with the day to day stuff. They don't cure everything, but it's like a little bit of buffer between the reality of it all and the pain that reality causes.
Of course you can slow down the divorce process, you're in charge. But if I can advise you at all, I would say take a few days out, indulge your feelings, keep posting on here and better people than me will be along soon to help you, and think about yourself. If you get ADs, then they'll take a couple of weeks to kick in, so use that time to lie low, don't make any decisions about contacting him, and stick the divorce on the back burner for a week or two.
You're only human love, and this is all natural.
This too, will pass.
Hugs xx