I've gone a bit wheezy after doing my shin in. I'm pretty sure it was a badboy combo of heat (summer, remember that?), lack of sugar and water (you know when your vision goes a bit and legs go wobbly) and the fact I have a phobia of blood. I have also fainted once in my life, and it was about 4 months ago, embarrasingly in a room full of people at uni during a first aid course. No idea what caused that, possibly being cooped up in an air-less room for a hours. Maybe yours was to do with the heat in Italy? If it happens again I'd go see El Doctoro.