It sounds like some depression sneaking in. I was thinking pretty much what Shannon said. You've been through so very, very much these past several months. It makes sense from the outside looking in that more or less "slamming back into normal" would have an effect on your emotions. Mix that with just giving birth and it's totally understandable. I'd definitely talk to a Dr. as soon as possible and see about meds or supps to help you over the hump. Hang in there, hon! It'll get better.