I'm stuck

I'm stuck. Sometimes, when I'm feeling a bit ill and I've got lots of things to do, I can't do anything. My head's been like that all week. S'just stuck. It's not writer's block, it's just anything block – can barely get up and come into work, can't sleep, can't write or email, can't motivate myself to even drink a glass of water or go home at the end of the day. Very odd, but it's definitely a "number of things" problem.