To be sick or not to be!

The one thing I find with working from home, no matter how sick I am, I work, as if I am not. If I was working in the corporate world and I did not feel well, I would ring in sick, with working for myself and working means money, I find I dont, take off sick time anymore. If I dont work, I dont get paid and the work does not get done, therefore clients can complain so its easier to work the sickness off and deal with it early morning and at night and get through the days work. When you run your own business there is no place for sickness and especially so if you are busy 24/7. How do you deal with sickness in your business when you are working solo?