Situations can quickly escalate and get out of hand if you aren't at least a little bit careful this week. Usually this is not a bad thing, exactly; it's more just a matter of 'too much of a good thing.' You probably don't feel as self-confident as usual, which could convince you that your performance at work is lacking. Still, meetings and appointments could work out fine, because your intelligence and competence are still coming across to others -- even if you don't realize it.
But your self-doubt could still be hard for you to handle, and forcing yourself out into the world isn't a great idea. Your standards are too high right now, both for yourself and your own performance as well as that of the people around you. You may come across as a self-righteous know-it-all, just because you're trying not to seem like an idiot! It might be smarter just to delegate your projects at work to other people so that you can get a little much-needed downtime. Connect with an old friend, someone who makes you feel good about yourself and reminds you that the world is a special place, and you're a very special part of it. That renewed sense of optimism will quickly be radiated back out to the world.