Her own stomach twisted at the thought of how easily he might have been killed.

Now, his stomach simply twisted, and he felt sick at the thought of taking pretty much any action.

Except, even as I thought that, my stomach twisted a little.

His stomach twisted around itself as a reminder of how long he'd gone without food.

My stomach twisted, and I began to feel a little dizzy.

Why is it that using the mirror now leaves her stomach twisting?

My stomach twisted at the thought, yet I forced the worry back with logic.

His stomach twisted, and the hallway in front of him doubled itself.

Dix asked, his stomach twisting at how long this was taking.

His stomach twisted painfully as he worked the controls that would play back the message.