I recently had a very odd sickness (and am still undergoing it): I woke up one day (I was fine before), and I had a soar throat. I didn't think much of it, but at midday I also had next-to-no energy, and basic things like walking and thinking clearly I was very slow at doing. So, I thought it was just some kind of flu. The soar throat aspect only lasted a day or two, but the energy thing was at its worst for almost a week, and I've been abusing my refrigerator ice machine. Now, I have a fairly irritable cold! Never have I gone through so many different types of sickness in one run! Supposedly I'll have symptoms for another week, D=
If its serious enough, I'll stop working or schooling or whatever and take a break from life (T.V, reading, games). My opinion is that you should rest and get well quicker, and not spread what you have
I also had a neat idea to plan and update when I can a program for the next time I am sick, so I can make the most of the time I'll have being motionless,

TL;DR What do you do when you're too sick to work or do your normal routine? Keep working, or take it easy?