sick to one's stomach - Phrases/Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Also, sick at one's stomach. Nauseated, vomiting, as in I always get sick to my stomach in the back seat of a car. [Mid-1600s]