I get what you're going through because I'm finding so many spots in my novel that I was relying on poor methods of conveying emotion... and when I was showing, I was showing in the same-if-not-similar ways each time.

I've had to change about 20 "the knot in the pit of my stomach" to other symptoms of anxiety and dread.

So be careful when you do find better ways to convey emotion that you aren't repeating the same thing over and over. Only real time I don't bust my ass for repeating would be if it's crucial to a metaphor or other kind of pay-off I'm working up to in that chapter. Sometimes it's tricky to balance all the elements in just the right way.