after giving birth?

I have recently given birth on the 27th October to a beautiful baby girl! I'm so in love with my baby and can't get enough of her. I have been so down and miserable since. All I feel like doing is crying and feel scared for some reason. I spoke to my mum about this and she was really nice about it and let me sleep with her and baby during the night. She helps me a lot with the baby and has done since the birth. Is it normal to feel like this?