anger vs eat away at

anger

verb
  • To cause such a feeling of antagonism in. 

  • To become angry. 

noun
  • A strong feeling of displeasure, hostility or antagonism towards someone or something, usually combined with an urge to harm, often stemming from perceived provocation, hurt, or threat. 

eat away at

verb
  • To cause to feel uneasy, troubled, worried, guilty, or vexed; to bother about something. 

  • To erode. 

  • To consume or use up, erode or wear away gradually. 

How often have the words anger and eat away at occurred in a corpus of books? (source: Google Ngram Viewer )