Oh Sweetie, I could have written your post 15 years ago...but I promise you I was much, much worse. After DD1 was born I felt totally trapped and suffocated, and dreaded having the responsibility of her. To be honest I knew something was very, very wrong before we even left hospital...I was scared of being alone with her and just felt utterly bereft, and that my life as MaQueen was over.
I also had a career I absolutely loved, and dreadfully missed my independence and freedom. I hated that DH could just leave us for 8 hours a day, and my poor Mum used to come over every, single day to help me because I just couldn't cope. At all. I just wasn't rational much of the time, and it was terrifying.
My HV was fantastic and got me an emergency appointment with my GP who immediately diagnosed PND. I was one of the very unfortunate women who react very seriously to hormonal changes (I had suffered a similar depressive spell when I tried the Pill back at university). I started ADs immediately, and within 6 weeks I was coping so much better 
I slowly began to fall in love with DD1, and by the time she was 5 months old the love I felt for her was so fierce it was primeval.
Fast forward 15 years and we are very, very close and she is an absolute joy to be around 