I've taken it before, not for post partum, but for panic and anxiety. I remember having very vivid dreams for a few weeks (they even call them "Paxil Dreams" on panic support boards) that were actually enjoyable for me. Anyway, Paxil worked well for me and I had no side effects once the dreams subsided. However, Paxil does have evidence of a higher risk of suicide in patients under 25-30 years old that you might want to talk to your doctor about if you are younger. Good luck!!
I'm on it and so far my only issue seems to be vivid dreams and sleepiness. My psych switched me from taking it in the morning to the evening and that seems to help with the sleepiness. Otherwise, it's been fine for me, although if you are on it they highly recommend birth control since it's one of the worst depression meds in terms of birth defects.
Re: Paxil