chemically imbalanced vs fucked in the head

chemically imbalanced

adj

  • Mentally ill. 

  • Used other than figuratively or idiomatically: see chemically, imbalanced. 

fucked in the head

adj

  • Not quite right mentally: perverted, stupid, or mentally ill. 

How often have the words chemically imbalanced and fucked in the head occurred in a corpus of books? (source: Google Ngram Viewer )