1.   He felt his stomach heave and he retched against the wall.

2.   Your stomach heaves uncontrollably, and vomit spews out of your mouth into the sink, splashing back up into your face.

3.   My stomach heaved and I felt sick.

4.   Despite the bright fluorescent lights and the whine and rumble of the train, Romero slept, his stomach heaving steadily, a light snore under his breath.