Emotional Pregnancy

My fiancé and I are currently going through a messy custody battle with the mother of his child. He is going for primary custody because the welfare of his child is in jeopardy when with the mother. (Not going to get into examples) I found out I was pregnant on Saturday! While he and I are both over the moon excited my emotions are absolutely dreadful. One moment I can be so happy and in love the next moment I want to rip him a new a-hole! I don’t know how to work through these emotions, I understand a lot of it is super hormonal and the stress of the custody situation. It’s been quite difficult. Can anyone give me any advice to help control my mood swings or different ways to deal with stress??? Please and thank you!