formication vs mania

formication

noun
  • An abnormal skin sensation similar to that of insects crawling over or within the skin; a tactile hallucination involving such a sensation. A common side-effect of substance abuse, it can also be experienced with high fever, menopause, skin cancer, diabetic neuropathy, or herpes zoster. 

mania

noun
  • The state of abnormally elevated or irritable mood, arousal, and/or energy levels. 

  • Dotcom mania was slow in coming to higher education, but now it has the venerable industry firmly in its grip. Since the launch early last year of Udacity and Coursera, two Silicon Valley start-ups offering free education through MOOCs, massive open online courses, the ivory towers of academia have been shaken to their foundations. 

  • Violent derangement of mind; madness; insanity. 

  • Excessive or unreasonable desire; insane passion affecting one or many people; fanaticism. 

  • 2013-07-20, “The attack of the MOOCs”, in The Economist, volume 408, number 8845 

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