post-partum depression??

I had my little girl back in October and since she's been here I've been a little off wack...It seems like me and my husband can't get along for nothing...I feel alone..unloved and I feel like I'm constantly having to watch what I say to not piss him off. I love him but I'm getting supper tired of getting attitude constantly from him. when I try talking about how I feel it is always turned on me like I'm the one causing myself to feel this way...what should I do? is it really me causing all this bs in my life right now? I want to keep our family together but is it really worth it?