moodswing
nounUK /ˈmuːdswɪŋ/
US /ˈmuːdswɪŋ/
A moodswing is when your feelings change quickly from happy to sad or angry.
After a moodswing at lunch, she was laughing again by the afternoon.
OTHER MEANINGS
2. A sudden change in the overall feeling or atmosphere of a group or place.
The party had a moodswing when the music suddenly stopped.
3. A quick shift in the tone of a story, song, or performance.
The song takes a moodswing from cheerful to sad in the last verse.
4. A rapid change in how someone reacts to things over a short time.
His moodswing made it hard to know if he wanted to play or be alone.