Hello lovey, i'm so sorry for what you are going through. I can only imagine how painful it is for you; i've been thinking of you lots since I read that your little .Angel passed away.
Perhaps it would be a good idea to go and see your doctor, s/he could refer you a group local to you where you could go and talk with other people who have gone through the same thing. I think that might really help you; the worst thing is to feel that you are alone. You mustn't feel guilty for feeling how you do - it's all part of the normal grieving process.
I think .Tanyaface's idea of a tattoo or book to memorialise your daughter is a really good idea. Perhaps plant a little tree in your garden or go somewhere beautiful and release a balloon in memory of her? These are things I have known other people do and they found it helped them feel some kind of peace.
Remember, .Angel doesn't want her mummy to be sad, she knows you miss her so much and she is with you in spirit, and always will be.