Hi Eagle, with my PND I took sertraline at the lowest dose, which helped enormously. I do understand the science behind reproductive depression, but sometimes I think it's more the lack of sleep which then feeds upon itself until you're literally going nuts ☹️ And if there's no one else to give you a break, eg you could express and your partner might be able to do night shifts on the weekend So you could try and sleep in another room....that then multiplies everything. Do you not have any family or friends nearby? I didn't and I know how hard that is. Does a health visitor still come weekly?
I'm so sorry you're feeling like this. I agree with LadyBT, hormones will probably take more than two months. And I feel you when you talk about contented mothers. Parenthood is hard, end of.
Try and do your very best to at least relax of a night when he is asleep there with you - hard I know, that hyper vigilance is tough.
Thinking of you xx
ps - also, just because you've chosen the hormonal route for now, doesn't mean you can't change your mind and opt for anti depressants after all. It is always, always your choice. I held out until my daughter was 4 months old, and after the first week or two when they'd kicked in, I wondered why I'd taken so long. Not a magic bullet by any stretch, but absolutely helpful in terms of coping xx