Cambridge English dicctionary has “causing extreme worry” as the 2nd definition of “agonizing”: https://dictionary.cambridge.org/dictionary/english/agonizing ht

Cambridge English dicctionary has “causing extreme worry” as the 2nd definition of “agonizing”: https://dictionary.cambridge.org/dictionary/english/agonizing https://dictionary.cambridge.org/dictionary/english/agonizin... An example they give for this definition of the word is: “She went through an agonizing few weeks waiting for the test results.” — which is how the GP used it.