I'm the same as you with the maybe had, maybe haven't category. I went Madrid and Wembley like yourself but the night of the Sheff Weds cup game, started to feel a bit of a cold coming on. Woke up the next day whole body was aching with a bit of a dodgy throat which got worse throughout the day till I got sent home from work, with a very very high temperature yet shivering. The thing I don't get is the bad symptoms only lasted maybe a day or so but I had a really chesty cough for a week and I couldn't run with it at all and no one in my house ended up with anything either.