Sometimes I get so frustrated I want to throw everything out in the yard! That is when it is time to leave the sewing room, chill out in front of the tv or do laundry or anything unrelated to sewing. Frequently after I get myself distracted by something else, I will have an "aha" moment and realize what I have been doing wrong and can go back and start over.
I remember exactly where I was and what I was doing when I realized that the tiny mistake that was driving me nuts would not even be apparent to most people! It was the most liberating moment of my life!