Really scary stats, yes. 
Rhubarb yes I agree with you. And to a PP asking if my reluctance to leave is about worrying about being on my own or the fear that I will never find love again, that's most certainly not it! I would love to be on my own with the DC. I crave it. Yes, I will be lonely sometimes, but I don't want to have another relationship, I want to focus entirely on the DC, because they are amazing. And they are becoming increasingly wary of DH who shouts at them more and more.
I do think if we are going to separate, the sooner the better. Firstly, the DC are only 6 and 7, and I think they would see it as a big adventure now, moving house, getting a new bedroom. Not seeing Daddy as much wouldn't worry them too much I don't think. And I'm hoping they'd be too young to go through the "this is happening because I'm too naughty" thing that I went through when my parents separated when I was 12. And secondly, if we don't drag it out, it can hopefully be more amicable, and we can remain friends, which will be SO important for the DC.
The only things stopping me making the decision now are practical reasons ( we need to do work on the house before we put it on the market) and the massive fear of upsetting people. I find it really hard when I cause upset, and this is going to cause a shitload of that 
On a more positive note, re the self care thing, I have downloaded an app called Fabulous to help me with this. It's a bit cheesy, but sets goals, starting small. Today's is just drinking water. Since yesterday I have also shaved my legs, trimmed my bush right back, de-fuzzed my face and moisturised. For me, not him. There is NO WAY ON EARTH I could face having sex with him currently, it would just make me feel like shit.
Thanks for all your support, it's much appreciated.