ag·o·ny

/ˈægəni/ noun, pl -nies

: extreme mental or physical pain

[noncount]

She was in terrible agony after breaking her leg.

He died in agony.

The medicine relieves the agony of muscle cramps very quickly.

the agony of defeat

It was agony to watch him suffer like that.

[count]

He suffered no agonies of guilt/remorse/regret over his decision. [=he did not feel guilty about his decision]