You lose your head when you get upset and lose control of your actions. Example: "I got so angry yesterday. I completely lost my head." Example: "I'm really sorry about what I did. I lost my head."

You are overcome by emotions (especially anger) and lose control of your actions when you lose your head. Example: "Okay, I'll tell you what happened. But first promise that you won't lose your head."

A person who loses his head is not in control of his actions because is not thinking clearly. Example: "He lost his head, so they threw him out of the game."