Sort of. Nettie goes to Mr. Gaunt for help with her arthritis pain and he gives her an amulet to ward off pain. At 1:03:07, when he tucks it into her sweater, she has a brief hallucination (about seven seconds) of having sex with him that he implicitly put in her head against her will.
The actual phrase is ‘I’ll commit suicide if I look like that’. It refers to a photograph a couple is looking at. On another occasion a child is holding a gun to his own head with the intention of using it.