You may not get a chance to read this, but there is a brilliant article in the Style section of the Sunday Times about just this topic.
The author, who wanted to remain anon mourned the loss of her marriage when their child arrived and described her feelings of incredible rage. I was nodding my entire way through it. The good news is that it gets better over time, provided your DP is basically a good'un.
A lot of men don't get babies, mine didn't. He also loved the fact that before baby I was calm cool and collected, but during the first few weeks post birth I cried every day, at least once. I hated DH because he got to go into work, meet other people, wasn't tied to the baby all the time, wasn't covered in baby wee and too tired to change his clothes.
Once your DD starts to sleep through, things will start to seem a lot better because you will be able to discuss things calmly and agree splits of work without turning into a hormonal mess.
15mths DH and I are good again, I get rushes of love and we cuddle and have a good relationship, its not quite the same as it was beforehand, but its pretty good.