If I get sick on a work day I usually try and tough it out, I haven't called in sick in 2 years, but I've gone in feeling pretty bad. Had to leave a couple of times during a shift to throw up, but I finished the 9 hours, I felt better for doing it as well. During my final years at school I only took time off if I was really sick, probably only 5 days or so in my last 2 years, before that I took more time off as Galandular fever which sucked.