My husband stayed home the first week after I had the baby, when he went back to work I went into a bad depression for a few days. I was so sad and upset. It leveled out for me. A lot of it had to do with how overwhelmed I was, I was adjusting to two kids, a ton of appts, and my sons school, plus lack of sleep. I would give it a few more days and see if you come out of it at all, if you don't I would talk to your doctor. Sometimes it takes a while for your hormones to level out from the pregnancy, and lack of sleep and adjusting to a new baby is hard. If you don't start feeling better definitely talk to your doctor, depression after having a child is very common and nothing to be embarrassed about, you'll get the treatment you need (if you need it) and it will all pass. Good luck hun, and congratulations!
Talk to your doctor, sweetheart. Even if he or she doesn't think it's post-partum depression, it will do you a load of good to talk about it. But it does sound like ppd, don't be embarrassed!!!!!!! it's hormonal and not a character failing.