(one's) stomach is in knots

(one's) stomach is in knots

One is confused, anxious, worried, and/or upset (about something), causing an unpleasant feeling in their stomach. My stomach was in knots for days leading up to my Master's thesis defense. James told me that his stomach is in knots because he knows he has to break up with Danielle.
See also: knot, stomach
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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