It WILL go away. I suffered from PPD as well, but it got better eventually. I realized I had a problem when my daughter was about 2 weeks old and I was trying to put together her baby swing. I was having trouble with it and my husband asked if I needed help. I threw some piece of it across the room, crumpled up into a ball on the floor and sobbed hysterically. This was not one of my finer moments, but I knew there were some issues. When I went to the doctor, I cried with her as well- and I don't cry in front of people except my mom and husband.
Anyway, the point is my OB gave me some samples of a medication that I can't remember it's name right now, but it made me feel sooo much better. I'm not a huge proponent of medications, but I knew I had to do something to make the horrible feelings go away.
You're not alone and you're not falling apart. You're recovering from the biggest life change ever. It's OK and you'll be fine. I think every mom suffers from PPD to some degree at some point in their lives. My sister, who is the strongest person I know, was at home about 2 weeks after having her 2nd baby and called her husband at work, crying, to tell him he had to come home right away otherwise she was afraid they wouldn't have 2 children anymore. (Whether she would have really hurt her kids or not, I don't know, but she broke down and that was very scary.)
Please send me a personal message if you'd like to talk more. I know this is a tough time for you. Best of luck!