It was a rollercoaster of emotions.
C2An experience filled with rapidly changing and intense emotions.
It was a defining moment.
C2An event that significantly shapes a person's character or future.
It was a close call.
C2A situation that was very nearly a disaster or failure.
It was a slippery slope.
C2A situation or course of action that, once begun, is difficult to stop and leads to something bad.