get a grip on (oneself)

To control one's reactions or emotions, especially during or after a stressful situation. After losing her job, Jill needed to calm down and get a grip on herself in order to drive home safely. You're not going to be able to think clearly until you get a grip on yourself. After I learned I wasn't getting the promotion, I had to get a grip on myself before going back to my desk.

get a grip on yourself

get a grip

INFORMAL

If you get a grip on yourself or get a grip, you succeed in controlling yourself and your emotions, so that you can deal with a difficult situation. A bit of me was very frightened and I consciously had to get a grip on myself. He told himself to get a grip: he had to stay calm. Note: You can also say that you keep a grip on yourself, meaning that you continue to control yourself and your emotions. He was trying his best to keep a grip on himself.

get/take a ˈgrip/ˈhold on yourself

(informal) make an effort to control your feelings, especially in a difficult situation: I know you’re nervous, but you must get a grip on yourself. You’re due to go on stage in five minutes. ♢ Look, Ben, get a grip, will you? If we panic now, we’ll be finished.