Hi, OP. First off, big unMumsnetty hugs from me! ##
I can't cut&paste, but I wanted to run through your list of things you think are wrong about you. ##
But start off with the analogy of the broken leg - have you heard it? If you had one, and were in a cast and needed help, or extra time to do simple tasks, or more therapy or medication or friends to have your back or time off work to heal, you wouldn't feel the guilt at all. ##
Ok, the list: ##
Abusive childhood, self loathing, rock bottom self-esteem, unwillingness to rely on others - all connected and not one damned bit of it is your fault ! You've been formatted from an early age to think badly of yourself, and - I hope you'll believe me (some day, if not today) - the fact that you've done so many awesome things DESPITE the way you feel about yourself, just leaves my gast flabberred - You Are AMAZING! Just imagine how much easier this is going to be when you're out the other end (and you will be, trust me) ##
Oh, and here's another thing you were formatted to do from an early age - perpetuate the abuse with your own children. But you didnt. Think on that for a moment. By the sounds of things, your kids have a stable, loving home and you're doing a great job. You'd rather self-loathe than pass the abuse on, and that's not ideal if course, but you protecting your children like that requires a strength you have no idea you have. But we can all see it. ##
I have no strong advice for the wish to have somebody else just take care of you, apart from this - yeah, we all do.
If you had that broken leg, it'd be nice to not have to get up and hobble around, of course. It doesn't make you any less of a valid person to want that, but as you get better (and I know you will), it'll decrease until you just get to the point where it'd be nice, yes, to have somebody there for you, but you won't need it, because you'll know that you're there for you. ##
You're resisting getting official help because you're concerned with social services taking your kids away. Ok, I can't speak for everywhere in the country, of course, but from what you describe, this shouldn't happen. You need support, and even as you are now, you're doing better than 7 of 10 of people. My belief is that if you proactively engage with them, they'd give you that support, a medal and a freaking parade! But if you want to be cautious, start with your GP and maybe even your local DV contacts. True (from what you describe) you haven't been abused by your current/recent partner, but there's been more than enough in your past that you need help untangling this specific issue, and from people who know what they're talking about. Look at the Stately Homes fred in relationships, for links to reading. ##
It's going to take a while, and a fair bit of work, but you can do this! And every accomplishment, no matter how small, will help you build up from there. ##
Finally (for now), if I were in your shoes, I'd level with your work place, maybe arrange an extended leave of absence - they sound nice and seem to value you, and business is a lot more clued in on mental health issues than you think. Don't just quit - let them have the chance to retain a valuable employee. ##.
Best of luck! Keep posting. And if I end up not having paragraphs, apologies.