MrsD - this is the first time I have admitted this because I was, still am a bit, irrationally ashamed of it, but I have been on Citalopram for the past 6 weeks. And the proof that it works is that I am happy to now admit it.
Ds is nearly 2 now, so I'm not sure I can calim my depression is PND - though I do know that I haven't felt this good since he was born. I had one very bad patch when he was a few months old, but got over that without drugs and with a lot of suport from dh, but still I think had low leveldepression - in terms of not ever being happy - but coping with everyday life. In fact, I "coped" brilliantly - I just hated every minute of it. Then a couple of months ago I started to feel like I was losing control of the pent-up nger and emotions I was feeling. I snapped at dh, at the kids, at everybody. I spent a lot of time looking after my children with my teeth clenched to stop myself from yelling at them. I often had to walk away from my gorgeous, but wilful toddler to avoid losing it with him whe he wouldn't do what I wanted. And I thought this was normal. The I started having suicidal fantasies. I knew there was no way I would ever kill myself, but I couldn't stop obsessing about how I could, and how lovely it would be if I could. And then one weekend I finally did lose it big time with dh to the extent that I was goig to pack his bags, and he wanted me to. And I realised that if I wasn't going to lose him, I had to tell him how I felt. And I did, through a very very long crying session that lasted the rest of the weekend and made him insist I went to the doctors on the Monday morning.
And after the first couple of weeks I haven't looked back. I still get frustrated with the kids and dh - but it's rational frustration, and I know that I can control it. And I actually like my husband now - and he hasn't changed. And I'm even back to initiating and enjoying sex - which he is extremely grateful for 
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I never wanted to be depressed. I did think people who were just needed to sort themselves out (though I would never have said that to them, or on here, and want to apologise profusely for even thinking it) but sometimes you need chemical help to get back to being your true self. I'd forgotten what a nice, happy person I was,though it wasn't until I became happy again that I realised what a sad, horrible person I'd become. I do so hope (and expect) that you have a similar ephiphany in a few weeks time.