Depression affects way more than just your mood, it affects the body too, so you will feel physically tired,your concentration goes, your sleep. And that's without having a baby!
Agree with REL, you can feel abysmal before you start to feel better.
Now, the changes in your life recently are enough in themselves to trip up your mood. Add to this the strife with your H, it's much more likely that you will struggle to cope.
Take you away from your surroundings, in a new area without much access to family, friends and familiar places and I'm afraid the ducks are all lined up!
Incidentally, do you feel better for talking about this with us? I hope so? You can't keep that bottled up, any one of us would need help and advice on how to get through it.
I hope your friend DOES come back to you. Perhaps your DH behaviour since can convince her that although he was wrong to do it, he has honoured you and respected you ever since.
You need to get DH on some kind of routine. He needs to be responsible for certain things happening, to help you with housework, child care and anything else you need help with.
Even without you being diagnosed with depression I'd say this, but with it, I say he absolutely has to support you. he needs to be asking how he can help you.
Keep talking to us, it ought to help. Depression loves isolation! Thrives on it. The only way to beat it is to not lock yourself away, but to get out and to do things even depression is telling you there is no point. There is always a point to living.
coconuts, you are doing really well, considering what you have on your plate. Count on us however you need to, and we'll help you feel better.