Yeah, it's really nice to say, I have a baby who is teething and still sleeps through, takes decent naps even though we still have a few off days a week. However, that didn't come without a lot of training and tears. I still wish she would sleep better when we're out and about, but I guess I just don't have that sort of baby. There are some things you have to come to accept about your lo as parents. Once I realized that going with the flow, even though sometimes it's a bit hairy nap wise, makes my mental picture a lot less stressful, I felt a lot better about myself and my ability to be a parent.
But that didn't happen until I became medicated. PPD really skews your entire picture, because all you see is the negative, never the positive. Your life becomes centered around naps. Your day completely depends on how well your lo naps, or eats, or whatever. You never go out. You cry a lot.
In answer to one of your questions, PPD usually shows up within a year after the birth of your child. Mine showed up at about 3 months. It can last up to 3 years I believe. Getting help was the best thing I ever did for myself. It's hard to diagnose, because the symptoms fit very nicely into other disorders.
I can sit here and tell you not to stress about it because there are a lot more things that are going to happen that are harder to deal with between now and the time your dd moves out, but that doesn't help you now. The most I can say is, hang in there, this too shall pass! Every time I have to re-train it's easier, because she's already done it before. I'm not sure they ever "forget"...they just change habits, and unless you're stubborn about it and realize they're not really doing it on purpose at this age, they will get the best of you.
Hope you start getting more sleep soon!!
*HUGS*
Sonya =P