It's when your boss yells at you, or your professor makes you feel stupid in class, or you have big fight with a friend and you just can't stop replaying the scene in your head for days, sometimes for weeks on end.
上司に怒鳴られた時 教授に授業で馬鹿にされた時 友達と大喧嘩をした時 その場面を何日も 頭の中で 繰り返さずにいられません 時には数週間です