If I cut myself boning chicken, or saw my hand when I'm cutting wood, or stick a needle in my hand when I'm sewing (it happens everytime I sew) I just deal with it. No problem. The odd time I've needed stitches I've chatted away to the medical staff while watching them do the needlework.

But when the nurse takes a blood sample the tunnel vision starts, the clammy forehead kicks in, BP drops to 1 over zero and I really struggle to stay conscious. I've never actually passed out, but I've come close.

What's the difference?