The phrase "agony from a" is correct and usable in written English.
It can be used when describing a source of pain or distress that is causing suffering.
Example: "She felt an overwhelming agony from a recent loss that she couldn't shake off."
Alternatives: "pain caused by a" or "suffering due to a".
Then he died in agony from a rare blood disease.
In "Strong Island," Yance Ford tells a story of family agony from a personal perspective that nonetheless reveals crucial historical vistas.
The skeleton suggests he spent years in agony from a shattered kneecap, and may eventually have died poisoned by an abscess which rotted a hole through his jaw.
She was in agony from a malignant mass in her midsection, and even with the copious amounts of oxycodone she was swallowing, she needed a new fentanyl patch on her arm every 48 hours.
The ending was the one we feared, Hatton's attempt at redemption culminating in a crushing defeat eight seconds from the end of the ninth when he was left writhing on the floor in agony from a wicked left hook to the ribs.
Striker Luis Suarez, 27, was spotted making a miraculous recovery in Liverpool's victory over Norwich, seconds after writhing around in agony from a Leroy Fer tackle.
He quotes whole pages of the dictionary called out at random, paints a brilliant upside-down Elvis while correctly guessing who an audience member is thinking of, is unbeatable at rock-paper-scissors, and can make someone double up in agony from an imaginary punch in the stomach.
Former president Liu Shaoqi died as a prisoner in agony from medical mistreatment in a basement in 1969.
When Justine Evans (whom I took to be a canape specialist but turned out to be a canopy specialist) heard piercing cries of agony from her perch up a tree, she said calmly, "George has found an army-ant colony from the sound of it.
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And, for its part, an African panel found many culprits for Rwanda's agony, from the Roman Catholic Church to Belgium, a former colonial power.
