I know how you feel. I just started a new job and shift at work, having to learn a new skill, and the anxiety of worrying about screwing up has been downright exhausting. I'm able to "put on a face" at work, but by the end of the day I'm completely wiped out. My off days (like today) are filled with sitting around doing nothing even thought there are things that need to be done. I just can't work up the motivation or energy to get going.