anguish vs bust a gut

anguish

verb

To cause to suffer pain.
To suffer pain.

noun

Extreme pain, either of body or mind; excruciating distress.

bust a gut

verb

To develop a pain in the side from laughing hard.
To work or try very hard.

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