From Longman Dictionary of Contemporary Englishstomach-churningˈstomach-ˌchurning adjective if something is stomach-churning, it is extremely unpleasant and makes you feel sick the stomach-churning extremes of physical torture
Examples from the Corpus
stomach-churning• For much of the past week I have had this dreadful, stomach-churning feeling of imminent disaster.• At the end of every set of three levels a stomach-churning guardian awaits.• G-Loc the coin-op only worked because of its fast, exciting graphics and stomach-churning gyroscopic cabinet.• Already, Mark Leiter can feel the difference this spring training from the stomach-churning ordeals of years past. 