feeling awful and helpless

I'm one week pp and I'm trying so hard to stay positive. My son sleeps great during the day but come 2am-7am he will not sleep. He will eat, calm down, and fall asleep in my arms but the second I go to lay him down he starts screaming. Nothing will calm him down. I feel helpless. I want to scream at him and shake him and tell him to calm down but I push those thoughts away. I'm crying when he's crying. I have a feeling I'm developing ppd but I'm scared to talk to anyone about it. I don't want to feel like a failure at just a week of being a mom.