lose one’s head—
1. lose one’s presence of mind; become confused:
- Don’t lose your head and start the car in gear. Take things quietly, put the lever in neutral….
2. become emotionally attached to a person:
- She is at the age that she loses her head over every other boy she meets.
lose one’s mind—lose one’s mental faculties; go crazy:
- Robert lost his mind and was committed to an insane asylum.