When I have a minor ailment I only have one rule: Don't think. I'm not allowed to think about anything other than the immediate fix for whatever is ailing me. If I'm full of snot & feverish, I go to bed & stay there. A mild stomach bug? I don't do much until I'm able to eat normally. If I'm feeling restless or bored (a sure sign I'm on the mend) but not 100%, I might get down on the floor & do some stretching. Stretching feels good & keeps me limber for more intense movement later.