I would say I've had depression in one form or another for most of my life.
Obviously it saw its chance to rear its head again after I had the DSs.
Can I just take a small issue with this that you posted, Sophable:
"the lack of support some women face having had a baby, the ambivalence they feel towards the baby and their hatred of themselves for that, all the stuff brought up about their own relationships with their early caregivers can contribute to post-natal depression."
I've never felt ambivalent towards the boys, nor hated myself for my feelings towards them - I adore them and have never once felt anything but protective and nurturing towards them - it was THEM (paradoxically) that kept me going if that makes any kind of sense, because I could easily have seen them as the cause of the problem, I realise that.
I may be unusual - I don't know. But I do feel part of the stigma in saying "I have PND" is people thinking "ah, she must want to throw her baby down the stairs, the heartless bitch".
I don't have some deep trauma in my past - I am just naturally a mixture of violently cheerful and ridiculously morose, I think. I am very self-critical too and I worry a lot. I also don't care what anyone else thinks of me - another paradox?!