Something is scaring him.
3 seconds sound clip from the The Tingler (1959) movie soundboard.
You can hear this line at 00:39:33 in the Blu-ray version of the movie.
Quote context
[...]
- Emotionally, I begin to feel somewhat apprehensive. Probably normal, however.
- The room is closing in on me.
- He's talking again. I wish I could hear.
- The room is closing in on me. You've got to make it stop. The walls! The walls!
- Break the door. Break the lock. He may be suffering. That drug may be hurting him.
- He's only suffering in his mind. Nothing is hurting him.
[...]