Froggo, I've sussed you from your posts. You have had a very heavy drinking binge weekend, you are still feeling pants and you need to skive off work for a couple of days and you would like to play the 'It's too hot to work card'.
Thats the bloody trouble with this country, a bit of heat and everyone wants the day off, a bit of cold and it's the same.
You're suffering from dehydration due to the alcohol and it's even made you sick. I suggest you eat a nice fried egg butty, drink loads of water, take a nice big bottle of water to work with you and GET ON WITH IT!
Failing that, tell them your gran died and spend a nice day in the garden.