I'm sorry, I feel such an idiot now! I was on the phone to NHS Direct and just about to post a "what can this be?" thread in health when they told me to get him to hosp asap because it sounded very much like meningitis. He had a high temp, vomiting and this rash all over, blistery in places. They saw me straight away, did loads of checks and double checks and then diagnosed scarlet fever.
I just thought "scarlet fever? WTF is scarlet fever? Isn't that a Victorian disease?"
Then I wept with the shock and relief that it wasn't meningitis.
He's on a course of antibiots, has to be quarantined etc. Work actually calculated 5 days for the antibiots to work so said I should be back in by Wed! I told them to fuck off.
Sorry for the panic, but I have never panicked so much in my life!
Thank God it's just scarlet fever!