I love that term, the baby blahs! That's how I feel sometimes, and I definitely feel like handing DD over sometimes, too. Then I feel guilty b/c I'm "supposed" to be glowing and luvvvvving everything about being a mom, right?
It sounds from your post like you had PPD with your first? Although you were hoping to avoid it with baby #2, at least you will know the signs better and hopefully have an easier time knowing how to get the support you need, if it gets to the point where you need it.
I'm sorry you are having a rough time. Can you get some time to yourself to do something that might refresh your outlook? Something you enjoy like writing or swimming or hiking or something? Maybe that'll help you feel more enlivened if it's just a funk you're in.