I absolutely agree with the great advice given here so far - it's better to get in touch with a doctor sooner rather than later, and don't worry about the distinction between "normal" baby blues and PPD. that's your healthcare provider's job. I worked with pregnant women for a few years as an interpreter, and because of my role as first point of contact, I often wound up being more of a case manager than I expected (or was qualified to be, honestly). everyone has differing responses to the transition of birth and motherhood, and of course everyone's circumstances are unique. but no one should ever suffer in silence, even if they think their emotions are "normal," or that there's some other reason (besides a physiological one) for their thoughts and feelings. it's hard to reach out when you're feeling that way, but believe me, having been on the other end of the phone, your doctor, midwife, PCP, or whoever ABSOLUTELY wants to hear from you and help you when you're struggling.
I'm really glad we all have this space online to talk and seek advice! I think that by reaching out to us here, you're indicating that you do want (and need!) help managing the emotional fallout. that's great! it helps to hear from other people going through the same thing before calling someone else up, especially when you're trying to clarify your own emotions. I hope the people who've been caring for you for the last nine months continue to do an excellent job. let us know how you feel in a few weeks, and keep up the good work of caring for your daughter. you'll get through this period, and you'll be amazed how well she'll thrive despite your own turmoil. you'll take things one feeding at a time, and you'll get through it. take care; I'll be thinking of you.