Okay, so I'm going to go against the grain of millydots here, who seems to be promoting a Stepford wife approach to your situation, which is suppress your own emotions, smile sweetly, and blame any otherwise unacceptable behaviour from your OH on stress.
If you cannot talk to this man without it blowing into accusations about how ungrateful you are, or how useless you are or whatever, then you should leave. What is the point? Even if it isn't completely one sided (having a partner with depression is a big strain, as is being the sole earner), you both seem to be bringing out the worst in each other.
So leave. Take some time away from this toxic environment, away from the fights and accusations, and focus on two things:
- Your children
- Sorting out your PND.
Have you tried looking online for resources on PND? there is a lot of very helpful stuff out there, and you might be able to find a contact group. If the nurse you saw had a very bad bedside manner, you should consider writing a letter of complaint.
I'm not saying that you need to leave your partner permanently but there is just too much resentment at the moment for you to function. No wonder you're fucking anxious.
Speak to some of the organisations that others have listed. Speak to your family. Leave, and focus on yourself and the children. What you do in the long term about the relationship depends on getting those other two factors sorted out first.
Was this child planned? Since you were only together a year, I assume that it wasn't (sorry if that's a mistake). Was he happy about the pregnancy? To me it sounds like he resents you for "putting him" in this situation. Which is a douchebag attitude.