XP: PPD/PPA (an introduction, I guess)

Yeah, I'm the girl who keeps posting about how scared she is of SIDS. I think it's starting to get out of control. I'm not sleeping much and I'm barely leaving the room when DS is napping. Even with the Angelcare. Logic has completely escaped me; you can tell me that there is a 99.9% chance that DS will be fine, and I will focus on that .01%. I google SIDS a few times a week; I googled vaccine reactions for 2 weeks before DS's 2 month shots and worked myself into a huge panic...I mean, you get the idea. I'm starting to think I'm not enjoying my time with DS because I am so worried all the time. This is not to say anything about my guilt. Oh, the guilt all the time. I am not interacting enough with him, I didn't pay enough attention to him on xyz day, I am scarring him for life because I didn't pull over when he had a meltdown in the car, it goes on and on.

So, I know some worry and guilt is normal but this is taking over, and clearly I need to do something about this. I already have a call in to my midwife, who they said will probably end up referring me to another provider. 

Anyone out there have some PPA/PPD success stories they can share with me? I feel better just having called, but I'd like to know that there's possibly a light at the end of this tunnel.