How do I get dad to understand?

My son is 5 days old today. Me and his dad can't really get a long more then a couple hours lately . Normally when we argue it ends with me cry really bad. How can I get him to understand it's my hormones from having the baby. He just thinks I'm doing it to make him look like the bad guy. It really sucks because I cry over the littlest things lately and I do plan on talking to my doctor at my 6 week check up.