OP I am so sorry you're experiencing this. How old is your other child?
What time did he go out?
I cannot actually believe someone would do this to their wife. You've just given birth and you're looking after two children on your own, on your first night home. While he goes out and gets pissed!!
My fiance is 27 now. When we had our first child (together), he was 23.
I was in hospital for 5 days (induction, very complicated, painful, stressful etc).
I barely slept the whole time.
The SECOND we got home he pretty much ordered me to bed and said he would look after baby so I could get much needed rest. I slept until the next day and he did everything.
It was his first child, first experience of all this, and he still knew what the right thing to do was.
I'm really sorry your DH still hasn't learned to do the right thing by the time second DC has come. He could at least be fucking present for God's sake