Fluoxetine (prozac) helped me through a really dark time with PND. Mine started when DS reached 3 months. The new baby high was wearing off. Weirdly it was also around the time when the baby stuff started getting a little easier, with colic ending and DS starting to sleep for 4-5 hours at a time. Perhaps because I was no longer in panic and survival mode, and the motherhood thing felt so much more real.
I was constantly on the verge of tears, with a panicked feeling in my chest that never went away. I had vivid, dark dreams, and horrid thoughts about harming myself. I often had an overwhelming urge to just walk out the house in my pyjamas, and just go anywhere, walk and never stop. Every dirty nappy or crying fit was a huge failure on my part because I simply couldn't cope, and as I hadn't been able to breastfeed, I felt as if I wasn't a proper mother to my DS.
After about a month on Prozac, I felt a calmer, and as time went on I found it a little easier to deal with things. I slept a lot better, and this obviously helped with my overall mental health. Over time, I managed to get a little more energy, and this meant that I could do things during the day such as playgroups and seeing friends.
I wouldn't say that my PND, or general depression was 'cured'. I now have to cope with a 2.5 year old, and the last few months have been tough. However, I've found a few ways to cope. I'm not trying to be perfect, and spend a lot less time comparing what I do compared to other mothers. I'd love my boy to have a sibling, but I'm not sure whether that will be possible, and it's been hard to accept that. I think it's just important to remember that these tough stages won't be forever, and that you do get your life, and your personality back on track eventually, one piece at a time.