I take sick days. I have dragged myself into work a few times when I've been sick to last a few hours and head home.

I have a high-pressure job and I know I'm not doing my job the best when I'm not 100%, so I've learnt to take the time off if I need to. I used to be really bad and take work home with me if I was sick, but now I force myself not to do that, to crawl into bed and sleep.