I know what you mean re not going to work because I just don't feel I can face the world and then feeling guilty and worthless for doing that. I try to think of it as a 'mental health day,' that I needed it, so I don't feel guilty. And it's true, sometimes you may just need to stay wrapped up in blankets and not face the world. I get it. But feeling guilty and worthless can be a vicious cycle: feeling that way can make you feel like not going to work, going forward, even less. You deserve the time off, sometimes you just need it.