Take a break and do something else for a day or so. You'll regain your "strength" and see the project differently.
With Bonnie Hunter's mystery quilt last year, I made 100 units the wrong size. Ugh! I went back and made 100 more of the correct size and I'm glad I did. The quilt would not have gone together at all without doing so. I used the wrongly sized ones in another quilt I designed, and I like that quilt, too.