I had pretty bad PPD after Robin's birth. I'm expecting it again. Although once I recognized it as PPD and claimed it, I felt a bit more in control. It was just so hormonal - I could almost physically feel it lifting when she was just under a year. It wasn't fully gone, but mostly and it faded pretty quickly after that. I had said that I would never do that to myself or my child/children again - I would definitely seek medication if I have it again. I'm not super pro-meds, but for me PPD is so chemical, I'm totally willing to use chemicals to address it. But now we are in a unique position - we are probably moving back to china at 5-7 weeks post partum, possibly before PPD really sets in. So I'm not sure if I'll seek meds here or try to do so there if I need them - but I will definitely try to be aggressive about treating it this time.
My situation is very different this time around also. We moved a few days after RObin's birth, into MIL and FIL's house b/c we moved towns and hadn't sold our house yet. So I had no space or feeling of control over my home, plus all the transitions of new motherhood, leaving a job and city i loved, moving in with people who have very different values than me, etc. It was TOO much change all at once - i feel like I set myself up for PPD. This time around, I am worried about the logistical difficulties of having 2, of being in Shanghai w/o a car or a network of family for support. But, DH and I have so much more time together there, so much more family time and control over our time and space. I'm just trying to be more realistic about what I can and can't handle and not set myself up for hard times.
Also, I felt like physical activity helped me feel so much better when struggling with PPD after Robin, and so did feeling like I had physically recovered after her birth. So I am dedicated to helping myself heal and getting active soon after birth - and DH is very supportive of anything that will help me feel better. Having him on my side was so priceless, and I don't know that I would have ever felt better without his help before.