Yes, I think my PPD was worse because of attachment parenting. I tried it with my second child (my first was 2 1/2) when she was born. My husband called the doctor when I curled up on the floor in the fetal position crying uncontrolably after spilling my son's breakfast - a class A tantrum on my part.
The doctor put me on meds - Zoloft worked great - and told me the following: Attachment parenting is a wonderful theory. What parent doesn't want the best for their kids? All different cultures have different parenting techniques and all different cultures end up with great people and some not so great people. In practice, carrying a baby around all day was physically exhausting my body when it was trying to heal from pregnancy. Add to it exclusively breastfeeding (I did for a year with both my kids) and a 2 year old with a boatload of energy and I was literally having the life sucked right out of me.
The meds helped me enough to be able to start making some additional changes - asking my husband for help, doing a project that was just for me and made me happy, reading a trashy magazine, etc. - and that helped. My daughter is now 2 1/2 and my son is 5 and they are both doing really well - so am I. A happy, patient mommy makes for happy kids.
One thing I want to note - PPD or any sort of depression is a DISEASE, not something cured with more sleep and vitamins (like the ever so ignorant Tom Cruise believes). The OB's have seen PPD and all kinds of versions of what you are going through. They are a wonderful resource for finding a solution that works best for you. If you had a broken arm, you'd go to the doctor to get a cast, wouldn't you? Get to your doctor. NOW.