I had a traumatic labour with my DS 18 months ago, and then suffered from PND. Counselling and AD's have helped and 98% of the time I feel great, resilient and like I'm not the worst mother that my DS could have 
But then it just takes one bad night's sleep, or one pretty normal but tedious thing like a puncture or something, to send me spiralling back to square one. Short tempered, panic attacky, close to tears.
Will I ever be NORMAL????!!!!! How does everyone else seem to function so bldy well??!!! sigh