feel sick at heart

feel sick at heart

To feel a deeply unpleasant emotion, such as grief, remorse, dejection, etc. I feel sick at heart to think that I may have contributed to her death in some way. Poor Tom's felt sick at heart ever since his mother died.
See also: feel, heart, sick
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

be/feel sick at ˈheart

(formal) be very unhappy or disappointed: When I realized the accident was my fault, I felt sick at heart.
See also: feel, heart, sick
Farlex Partner Idioms Dictionary © Farlex 2017
See also:
References in classic literature ?
Personally, I see difficulties in the way, and feel sick at heart at the mere prospect.
"I may not be around to discuss with you what I have written here...Wherever I am when you feel sick at heart and weary of life, or when you stumble and fall and don't know if you can get up again, think of me.