Thanks for posting, lela. I think you have so many fears and worries crowding into to each other that it's no wonder you feel crushed by it. But try to remember that your fears are just that - fears. They are not premonitions. You're not psychic, you don't know the future. I'll bet that if you had asked tethers at 37 weeks pregnant she'd have sworn she'd never get used to a baby of the "wrong" gender, she's always be bitter and miserable, and wouldn't have believed you had you said that she'd actually be out and out happy in the future.
But she is. And that is a genuine and real possibility - likelihood, in fact - for you. Don't cheat yourself out of it before giving it a chance to happen. yes, maybe your dp would meet someone, but it wouldn't be you, and it's you he wants. Give yourself and him that chance to be happy - it has happened for other people who feel just like you, and it can and will happen for you. Your head is so crowded by hormones, exhaustion, the end of pregnancy weariness on top of all the stuff that your childhood did to you. But the birth will be over soon, and you'll look back and see that it's something that you knew deep inside how to do, and your kind mw will be there, guiding you through.
And then - well, yes, there may be interim stuff like M&B and better ADs - but they're not what's really out there for you. What's really there is this real, extraordinary little individual, who's part of you, who will lie on your chest and feel warm and soft and smell amazing.
There are other ways to not let people suffer because of your mental health. You can get help, and treatment, and work to get past this. I know you're exhausted, I know it feels like it's too hard, but it's worth it, it's worth every last clawing hold with your nails. You have to believe this, and give your family the chance to be like tethers', to be like BeerTrick's - in a way to be like mine, or to be like people who've been through terrible PND - there are thousands of women who recognise your pain, lela, but who are on the other side of it now. And you'll get there too.