in my opinion, the baby blues/hormones can be easily fixed and the PPD is something that takes a little more looking in to. i had my baby on the same date as you, OP, (feb 25) and the baby blues kicked my butt our first week at home. but it would get better if i had a good meal, a good sleep, a good shower, or something like that. it seems to me like things are more serious than a touch of the baby blues of those things don't make it better, if talking doesn't make it better, and if you can't imagine a time when things could ever get better, and all those feelings last for a couple of weeks or more.
a person's mental health history would play into this big time as well, but thats more for the experts to contemplate than an internet message board. if you had any previous history with anxiety or depression, and were talking to someone about persistant baby blues or whatever, i'd mention the previous issues. i was diagnosed with an anxiety disorder earlier in my life. it "went away" during my pregnancy, for whatever reason, i just didn't have any symptoms. now that i have a teeny little baby and a lot on my mind, i'm paying attention to my body and mind's reaction to things. is this triggering old issues or is it just from the hormones? do i need to talk to the doctor about meds again or will this just pass over?
anyways, just my two cents.