I've been hearing rumblings of these symptoms, but nothing as to what could be the cause. I wouldn't doubt it was contagious, especially if it was the Muggle chicken pox. I'm no Healer, but I haven't heard of an outbreak of Dragon pox in quite some time.
I have the beginnings of a headache now, otherwise I'd go brew something for the fever at least. I can have something for you tomorrow. Things that affect the brain, such as fever reducers are a bit touchier to work with.