I have/had PND, just starting to come off my meds now after 16 months...it isn't easy, and its been a long journey and I've finally come to accept and cherish the person I've become, and cannot give my little girlie enough cuddles and kisses.
Take all the help you can get, never be afraid that people will think you are a bad mother, and try to get out of the house for a walk every day, exercise works wonders. I also find that if I know I'm going to have a bad day, getting involved in a task that involves lots of concentration, or 'active thinking' seems to help avoid the worse bits....baking does the job for me, my DH knows I'm not doing so well when I've made 2 cakes, brownies, a pie, scones and biscuits before midday!!!!
Something else I found was keeping a diary, but I would always rip out the pages when I was having a bad day, so that a) I could look back through it to remind myself of the good times, and b) as if to acknowledge that that day was done and dusted and wouldn't be repeated. Gradually, I've done that less and less.
Good luck with your journey, please PM me if I can do anything to help, even just a chat x