I know there to be two truths to quilting...
She who sews, unsews.
Sometimes you just need to throw a project in the corner and walk away.
Throwing it into the corner gets out the frustration and walking away gives you a clear head when you come back. I even have a specific corner I throw things into when I'm too that point. I keep that corner cleaner than any spot in my studio so when something gets flung into that corner there isn't any dust or dirt or anything to get on it.
Good luck, it will get better.