Sod's Law

Why do we always get colds at the worst times? I have come down with a some kind of cold (nasty sore throat, phlegm, headaches etc) just as I finish some work and have time to do the other 50 million things I need to do eg Chissie shopping, a gig and rehearsals for that gig, bands to go see, studio to rebuild and a short film to start, music to finish etc. What gives? Is this natures way of saying "chill out, son, take a break"? Getting sick always frustrates the hell out of me... oh, get over it. I'm going back to bed.