distressing vs heartbreaking

distressing

adj

  • Causing distress; upsetting; distressful. 

heartbreaking

adj

  • That causes great grief, anguish or distress. 

noun

  • The breaking of a heart; great grief, anguish or distress. 

How often have the words distressing and heartbreaking occurred in a corpus of books? (source: Google Ngram Viewer )