Anyone else not enjoying motherhood

I have a 2 year old and 5 week old. I loved being a mummy first time round but fuckin hell I'm really struggling 2nd time round. I cant help but feel I made a big mistake bringing a 2nd baby into the home. My baby never seems happy, constantly whinging, grunting, crying and screaming. My husband works nights 3 times a week not like hes any help during the night anyways. Tonight I've lost it and left my baby screaming upstairs whilst I screamed downstairs. I am not enjoying being his mummy. All I can think about is going out and getting pissed and staying somewhere else for the night so I can sleep all night without having to wake every 2 hours to feed a baby!