I went through a similar thing, but probably not to the extent that you are feeling. I do remember cringing and wanting to scream everytime the baby wanted to eat - I felt like I was only a walking bottle. I couldn't even remember what it felt like to get dressed nice and some days even what clean hair felt like. All I wanted to do was sleep. My husband really couldn't help me. Some of this is natural, expecially if you were a very independant women like I was /am!
It took time. But you WILL make it through. At one point I called my mom and told her that I just couldn't do it. She got very quite and then said something that still gets me through tough times...she said "you WILL do it, because you HAVE to. no one else can do it for you and that little life needs YOU."
All I can say is get help wherever you can. Find a church, utilize the daycare / mother's day out, even hire a babysitter once a week and go get a pedi. Get out there again so you can feel like yourself again. It is NOT selfish. Your baby needs a healthy you. I now have 2 beautiful daughters, ages 1 and 3, and I LOVE my life. You WILL make it. GOOD LUCK!