Self-tormentor

[Anger] macerates, and vexes the soul with fury, so that they become self-tormentors; Rage, and fury, tortures more then wrong and injury.

Source: wiktionary

[…] a little observation upon the affairs of men, assured me, that I might kick, and prance, and give myself airs, but it would all be to no purpose: that I should only live anxious, and go down into the grave sooner, for acting the self-tormentor; and tearing my body and constitution all to pieces:

Source: wiktionary

The very willingness with which she performed these duties, the cheerfulness with which she bore her reverses, and the kindness which withheld her from imputing the smallest blame to him, were all perverted by this ingenious self-tormentor into further aggravations of his sufferings.

Source: wiktionary

[…] his will was not always the servant of his intelligence; he was an agonist, a self-tormentor, who ran to meet suffering halfway.

Source: wiktionary