The phrase "a source of agony" is correct and usable in written English.
It can be used to describe something that causes significant pain or distress, whether physical or emotional.
Example: "The loss of her beloved pet became a source of agony that she struggled to overcome."
Alternatives: "a cause of suffering" or "a source of torment."
"This might be funny for you, but it's a source of agony for us.
For Mr. Klinghoffer's two children, Mr. Abbas's continued freedom remains a source of agony.
This was much debated and became a source of agony to one of the founders of the movement – William Morris – as he realised his influence had actually reached little further than north Oxford.
For managers, names have become a source of agony since the Securities and Exchange Commission decreed that by the end of July next year, 80percentt of a fund's holdings must fit its name.
The captain is as devoted to military honor as he is to his wife, and the implicit conflict between these commitments is less a source of agony than of exhilaration.
Joel says he quit writing songs because his standards were so high that the process became a source of agony.
To be sure, line closures and phantom out-of-service trains are a source of undeniable agony for many.
Naming a startup venture is part of the fun, but it can also be a source of huge agony and pain especially in the early days of a business when you really should be focusing on building your product and pushing it to market instead.
The son of an Irish father and a German mother, the young Hugo finds himself positioned in life at an exquisitely uncomfortable angle, whereby almost every aspect of his existence, from his language to the clothes his parents dress him in (lederhosen and Aran sweaters), becomes a source of ridicule or agony.
Take standardized testing, a source of all-around agony.
Nector and Margaret seemed to find in my agony a source of humor.
