Depressed

Need some advise.. My husband and I dated for almost 12 years. We married a year ago and just had our son who is 4 weeks old. We had soo much of time together. We planned and dreamt of so much together of the baby and our little family. But we never expected our baby to be fussy and crying in the nights. Since he has to work in the morning he stopped sleeping in the same bedroom from like day 2.. I miss him and that makes me terrible. I cant stop crying all the time.. he has migrains. So he says he cant wake ip once baby cries .. I was okay with it initially.. but now I feel terrible lonely miserable.. The mother in law comes to help me at niggts.. but its not as same as my husband.. I feel like I did a mistake having the baby. I just want to leave everything and run away somewhere alone.