What is going on?!

It's official.  I feel like poo.  How is it when I live like a hermit, only leaving the house for boring things like food shopping, I am perfectly healthy.  I've been here just over a week, out and about...perhaps going a little mental at the miserable bastard in Mamma Mia...I've been eating healthily, doing a bit of exercise.  And yet, I now have a stupid cold.  Not a snotty nose type cold (although there is that as well) but a proper 'no sleep for a week because you can't breathe' type cold.   You see, I thought I'd over done it a little, while screaming the words of 'Waterloo' at the top of my voice to make a point.  Fair enough, I can cope with a sore throat.  But where the bloody hell has all the other shite come from?!  Am currently drinking luke warm green tea (forgot it was there) at 4.10am.  I've had about an hour of sleep...I'll be nice to know in the morning!!  Blurgh!