Postpartum depression-Birth parents?! Anyone?

Hey everyone-I used to come on this site and read girls stories, I even got fairly involved for awhile but things in my life changed and I stopped. BIG MISTAKE! I ended up back with the birth father of my kids and got pregnant with him once again.
Now he is a great guy,very fun and loving and could be a great dad, BUT has struggled big time with drugs.
Anyway I placed my daughter four months ago…With my parents who have our other children. The birth father and I have broken up once again and this time I think it is for good.
I am reflecting on choices I have made, arguments we have had. Things that have happened in my life, and how I have felt.
I wonder if I have postpartum depression honestly, I can’t eat if I do its one meal or a meal and a half a day (this happened even before the break up) I am tired all the time and find myself crying basically on a daily basis..usually for no reason some because i have started stupid fights with the birth father.
i love him to death but i know he is so sick of it he is gone for good. i would be if i were him but i still want to know what is wrong with me?! why do i feel like this? is it a depression? or what? has anyone placed and had something like that happen? or been diagnosed with postpartum depression that could give me some insight? i am going to call my doctor about it because it is affecting every aspect of my life. just wondered if anyone out there had ever had anything like that before. 🙂 thanks all! 🙂