That was my first dnf in any race of any sort since 1988 and I've done 100 milers, Ironman triathlons, 200 mile bike rides.
I probably could have finished by walking (my stomach wouldn't let me run), but it would have been a joyless plod. Is that a good enough reason to stop? I have completed races in a worse state, but on this occasion it seemed pointless and unnecessary. May be I should have pushed on, but its too late now to worry about it.
My next race is a 100k in Cumbria, and I'll make sure I finish (don't want to start forming bad habits)
Colm