Exactly what Aculady said!! Great advice.
I was you 8.5 years ago. It gave me shivers to read your post. Looking back, I know I had a little PPD and it seemed to tip my perfectionism and borderline OCD over the edge. Nothing I did felt good enough and I felt anxious and unhappy about how was parenting my child. I think a lot stemmed from having a difficult child. The underlying gist from family and friends was that it was somehow my fault and I really internalized that.
I'm not going to lie.. it took a while to work myself out of that rut. I really had to lower my standards and MAKE myself say positive things out loud each day. Forced myself to list my blessings daily until they came to mind before any negative thoughts. Grinity had some great advice about thinking positively, as well.
I won't hang on you with virtual hugs either, just know you are not alone and that it will get better. (It really, really will I promise you!)