I can well believe that. When I was in my early 20s, I fainted when I was given a tetanus booster in hospital after getting a relatively nasty cut which needed

I can well believe that. When I was in my early 20s, I fainted when I was given a tetanus booster in hospital after getting a relatively nasty cut which needed stitches. I'm not in the slightest bit scared of needles/etc, hadn't lost much blood or skipped meals and was a fit and healthy young man. The nurse at the time told me it was very common and why they stayed for 5 minutes or so after giving me the injection. I've had a fair few other injections since then and not had it happen again.