excruciate|excruciated|excruciating

牙医的钻头声让他的神经疼痛难忍。

The dentist's drill sound ___excruciated his nerves.

看着他在舞台上忘词真是令人痛苦。

Watching him forget his lines on stage was ___excruciating.

我的牙痛得难以忍受，这简直是折磨。

I have an ___excruciating toothache that's almost unbearable.