Keep one's head
to remain calm and sensible when in an awkward situation that might cause a person to panic or go out of control.
to stay calm, especially in difficult or dangerous situations.
Ex: Can you keep your head at times of pressure and stress?
دست و پا گم نکردن // بر خود مسلط شدن // اعصاب را کنترل کردن
Lose one's head (over sth or sb)
to become confused or overly emotional about someone or something.
Ex: Don't lose your head over John. He isn't worth it. I'm sorry. I got upset and lost my head.
کنترلم را از دست دادم // دست و پام را گم کردم // هول شدم