seeking advice. unsupportive husband

This is my first pregnancy. I have one of those it's "really hard work" marriages. Every day is a battle just to stay together. After the 1st week of becoming aware we were pregnant it seems like he is more moody, anxious, overwhelmed and very angry. It's becoming harder and harder to keep myself feeling positive and pretending that I can also keep him happy during his downs. I feel sinking deeper and deeper. What should I do? Does anyone have experience with addicted, selfish husbands?