Expat - not allowed to eat or drink - that's appalling! No wonder you were in a bad way afterwards, especially after a difficult birth.
My story is almost exactly the same as Toothache's, although I was diagnosed when ds was 6m. I only felt that I had truly recovered when dd was over 1yo - about 3.5y after ds's birth - when I realised that I had come through the hardest part of dd's babyhood without developing PND again.
I was very very lucky - no I am very very lucky - to have the support of some very excellent people:
first of all my dh, he was truly a rock for me, even though it was just as tough for him. He took me seriously, never belittled me for what was happening, and never did anything to encourage my hideous opinion of my ability or suitability as a mother;
also my first HV, who never asked me to leave after my appointments (I sometimes stayed with her for 2 hours at a time) and diagnosed my PND and refered me for treatment to the health trust's Peri-Natal Outreach team.
The PNO team - I was afraid that I wouldn't be treated if I refused ADs, but they were perfectly willing to treat and support me nonetheless, and I had regular meetings at home with a CPN, and later an Occupational Therapist. I don't know how much help the OT was, but having a person there to listen and not feel embarassed for burdening them was excellent.
My second HV (I changed GP practice) - a wonderful, warm, intelligent, wise and experienced woman, who has supported and guided me for the past 4 years or so.
The GP who listened and refered me for counselling to the practice Family Therapist.
The Family Therapist who opened the door for me to start thinking about myself and why I behave the way I do.
The Neuro-Linguistic Programming practitioner I saw for half-a-dozen sessions, who built upon what the FT began, and also taught me strategies to use to modify my behaviour.
The psychotherapist to whom I was refered by the PNO team, who opened a huge great disgusting can of worms in my head, and consequently enabled me to decide what I wanted to do about the things that bothered me.
And finally, all those people all over again, whom I put on standby for myself the second time around as a safety net to catch me should I fall into PND again. I am firmly convinced that the reasons that I didn't fall again were (a) the new ways of thinking that the various therapies had taught me and (b) the 'safety net'.