Secrets from husband

My husband Is not the ideal husband. He has anger issues and other issues that i over look. I do this because no one in my family or even distant family divorce. That’s not the reason for my post. What i need advice on is whether to keep something secret from him. My daughter had to go to the emergency room due to a allergic reaction. My husband is unaware. I dont want to tell him because i dont know if he will act in anger or understanding. She is fine now. I have never hid anything from him because i don’t believe that is how marriage works, but he treats marriage differently than i do.