head over heels in love vs obsessed

head over heels in love

obsessed

adj
  • Intensely preoccupied with or by a given topic or emotion; driven by a specified obsession. 

  • Influenced or controlled by evil spirits, but less than possessed in that the spirits do not actually reside in the victim. 

How often have the words head over heels in love and obsessed occurred in a corpus of books? (source: Google Ngram Viewer )