BACK TO WORK

I tried going back to work yesterday. I really tried to work but I simply didn't have enough energy and even worst - motivation. What kinda illness effects you in this weird way, that you just feel apathetic, lack of interest? People keep saying "over worked" but I don't feel over worked or stressed out. It's weird. But for the first time (and I can always wish it's my last time!) I'm on... sick leave. Only for a week until next examination at the hospital. So what do you do when you're sitting at home not feeling like doing nothing at all?... Nothing I guess....