Nearly recovered from a cold and went flying. Unable to clear right ear on the second sector then something in my head went crack and I bled profusely from my nose. Like an idiot I didn't go to see the Doc and just went straight home.
Never been the same since and I tend to suffer from pressure changes more than I used to, in fact I can tell if I'm going to get a cold before I feel any symptoms as my sinuses seem a bit more sensitive.
I now never go flying until I'm completely clear, that's what standbys are for, init.