agonies of guilt/remorse/regret

:  intense pain of mind or body :  anguish, torture

:  the struggle that precedes death

:  a violent struggle or contest

:  the fact of having committed a breach of conduct especially violating law and involving a penalty

:  guilty conduct

:  the state of one who has committed an offense especially consciously

:  a gnawing distress arising from a sense of guilt for past wrongs :  self-reproach

:  compassion

:  to mourn the loss or death of

:  to miss very much

:  to be very sorry for

:  sorrow aroused by circumstances beyond one's control or power to repair

:  an expression of distressing emotion (such as sorrow)

:  a note politely declining an invitation