"I can't be sick. I should be working, and taking care of the house, the kids, my to-do list. I will get so behind this is going to be horrible."
If you are thinking these thoughts like most of us busyaholics are when we are sick, then you are right it will be horrible. How to be sick and feel good mentally is challenging but totally possible. It can actually be a time of reprieve even if you feel physically crummy. Take advantage of this pause on life.