Very sorry to hear that dude. If it's any consolation I've been in and out of hospital since getting back from Assen, didn't think I could ride at all until the TD yesterday. It was much better than I thought, so give it a go. It's only a 10 min race after all....
Sorry to hear that Chris. Hope you can get over it by Sunday. Painful condition, I know. Soda water is supposed to be good to help it clear up. Loads of water anyway and stay away from red wine. Lager's ok, apparently. The third tip I was given is only applicable to women ;-)