Seriously from what we've discussed in the past, he does seem to be a complete A hole. I'd definitely call in sick that week, and if you get any hassle, produce a Drs cert. I'm sure your Dr will be sympathetic if you ask for one that doesn't state you had an op on it. And if this doesn't work, give him a kick in the goolies so hard, he'll have to have an op!
Take care sweetie
