Baby Blues

I never really had them that bad with my other two children, but this one is knocking me on my butt!  I am crying while I type this and I really don't know why.  I feel out of breath and anxious.  Taking care of the baby isn't the problem, he's been pretty easy (other than the night sleeping).  I almost think I'm lonely -- that seems strange though.  I had planned on taking a few extra weeks off of work, but I don't know that mentally I can handle it.  I hope this goes away soon.