Her past mistakes continued to torment her every waking moment, filling her with regret and sorrow.
The loss of his loved one has tormented him for years, and he still struggles to come to terms with it.
The guilt of his secret has begun to torment him, and he doesn't know how much longer he can keep it hidden.
The memories of the traumatic event tormented her, making it difficult for her to sleep at night.
Her cruel words have tormented him for years, and he still can't forgive her for the hurt she caused.

Torment (Verb)