have butterflies in one's stomach vs whirl

have butterflies in one's stomach

verb
  • To experience a certain “fluttery” physical sensation in a person's stomach, associated with nervousness, uncertainty, anxiety, apprehension, or excitement. 

whirl

verb
  • To have a sensation of spinning or reeling. 

  • To make something or someone whirl. 

  • To remove or carry quickly with, or as with, a revolving motion; to snatch. 

  • To rotate, revolve, spin or turn rapidly. 

noun
  • (usually following “give”) A brief experiment or trial. 

  • Something that whirls. 

  • A rapid series of events. 

  • Dizziness or giddiness. 

  • An act of whirling. 

  • A confused tumult. 

How often have the words have butterflies in one's stomach and whirl occurred in a corpus of books? (source: Google Ngram Viewer )