Not being happy with your newborn !;(

Erika
This is my second child i have a 2 year old everything with was so different i enjoyed having him in my belly i miss my belly with him and when he was born i was so excited his my everything!!! I was just so happy to be a mom. I recently just had my second child which is a girl i was happy to have a girl you know the dresses and everything my lil princess and the last month before having her i just wanted her out!!! I just wanted her in my arms!! She is 6 weeks old and i just dnt seem to be happy to have her with me. Why is this happening to me ??? I start crying out of nowhere i get so sad i dnt want to know anything about her at times i get frustrated and sometimes i just hate myself. I cry at night and nobody undestands me not even my husband he instead yells at me and just doesn't understand me!!! 
Has it happen to any of yous ladies? 
Please help .. Some advice ???