I know your "extreme" reaction so well! I hope that after a night's sleep you'll be feeling a bit better, but just leave the wretched thing until you know you have some perspective on it, however long that takes. Until you get to that point, any more work on it will be counter-productive. I've learned that the hard way! In the meantime, have you got something else you can work on - something you enjoy, that soothes you?