agony of mind

"Anything, anything would be better than this agony of mind, this creeping pain that gnaws and fumbles and caresses one and never hurts quite enough."

“The rest of the world has, with a heavy heart and agony of mind, reached the conclusion that his power is indeed fading,” the commentary said.

It seemed as if that hope, which would have afforded him strength, and support, and energy, to combat every difficulty and overleap every obstacle, was taken away from him; and for five or ten minutes he paced up and down the saloon in agony of mind unutterable.

"Bring up the prisoners," exclaimed Charles of Montsoreau, with a degree of agony of mind that it is impossible to conceive.

No one, not even kind-hearted Mrs. Tate, could imagine the agony of mind she had endured.