be in love with vs have it bad

be in love with

have it bad

verb
  • Used other than figuratively or idiomatically: see have, it, bad.; To have a difficult time; 

  • To be obsessed (with); to be enthralled (by); to be in love (with). 

How often have the words be in love with and have it bad occurred in a corpus of books? (source: Google Ngram Viewer )