Prenatal depression

Since when I turned thirty weeks I've been feeling depressed. Started out more like anxiety but now it's all blown out mood swings. I'm snapping at my husband and crying a lot. Worse thing is he's just shut down on me which makes it all worse. I don't know what to do anymore. And he has started drinking again and he knows it makes me want to drink. Obviously I won't. I'm strong willed. But it makes me angry at him and the situation. I want to drink and smoke. It seems so unfair. I'm just so frustrated and feel so alone. I can't talk to my friends and family cause they wouldn't understand why I'm not happy. Any suggestions for me? I'm trying to meditate and exercise more. Eating better. But my marriage is not well, that's for sure. My husband used to talk to my belly every night and read him books. Now he doesn't even kiss it. I feel so sad and alone.