Translation of "Agonizing" in Japanese

It’s a vicious killer with an agonizing bite,

毒で苦痛を与える 邪悪な殺し屋で

She felt burning pain, agonizing in its intensity.

焼けるような 強烈な痛みでした

The protagonist is agonizing to make wrong things right.

主人公は間違ったことを正そうと 苦闘しますが

And there's an antagonist who's fighting against what everybody's agonizing for.

皆が必死に取り組んでいる目的に 真っ向から歯向かう敵対者がいます