Postpartum Depression

I have done some research on PPD and everything says "distant feeling from baby". Well I have the exact opposite of this but still wonder if I've got postpartum depression. I cry for no reason--or sometimes just silly reasons, I got very angry and very anxious with other people...but, at the same time, I never want to let my baby out of my sight and I just want to sit and hold her and stare at her all day. 
I found out when we got to the hospital that I had an infection that only 2% of women get and that could've killed both of us. So I wonder if maybe I'm just dealing with that or if this really is PPD. 
I filled out that little questionnaire at the hospital but no one was worried about my answers. So if I mention something to my doctor, will he just make me take the test thing again? And how do they treat PPD if they decide you have it?