My family has a history of depression. I was able to control mine most of the time, until PPD hit with both kids, starting in pregnancy. I finally got help when dd2 was about 2 or 3 years old, and things were not getting better with traditional treatments like yoga, exercise, etc. I am on an SSRI and it's working really really well.
However, the big, huge thing that has helped more than anything is getting a good night's sleep
. Dh is a horrible bed-mate when he's sleeping, and I didn't realize how much this affected me until I recently started sleeping in our guest room on a regular basis. For the first time in years I am able to feel good most of the time. I am more patient and overall happier and level-headed. Sometimes I can't fall asleep right away, especially on the days I don't exercise. If I just lie in the dark quiet and allow myself to daydream, it still helps. I would encourage you to try to get yourself into bed earlier rather than later, and find a quiet place where you won't have to wake up all night. If you are nursing through the night still, at least try to set up a place where you only have to wake up to nurse, but not be disturbed by your dh's schedule, his sleeping habits, or the other children. It really, really really helps to get enough sleep! I put my sleep needs aside for a long time because the kids needed me at night. I wasn't able to nurse, but I did cosleeping with dd1, and co-bedroom with dd2 and she was very sick for the first few years of her life. When they started sleeping in their own beds, I still had dh's snoring and jabs and blanket-stealing to deal with. If I do stay up late, I try to get an hour's nap in during the day when dd2 naps, or at least on weekends I try to take naps.
Oh, and I have also started taking fish oil (even though I'm vegetarian
), and making sure I take my multivitamin every day. I found that I'm a bit low on iron so I have started to take one iron supplement a day, too.