Am I depressed?😔

I had my baby boy on feb 10th and he was discharged from the nicu on March 1st. While he was in the hospital, and even now i feel extremely depressed. I cry almost every day, can't get any sleep and just feel hopeless at times. I have a 3&4yr old also, and they can be on the hard-headed side st times. I feel so ready to give up.. i just want this feeling to go away. I don't like my children seeing me like this. Everything sends me over the edge.. im constantly yelling and now i just don't know what to do. Any suggestions? Thank you!