Thanks for the reply, on advice rom the immunologist i take a antihistamine daily. Not a clue what the alergen is, never happened before and not since. I was back in the gym within the week (Epipens in locker !!), even after food and have eaten within the hour after too, no reaction at all.
As a matter of interest, i'd never heard of exercise causing it either...untill i read the leafelt that i keep in my wallet that came with the pen's, it's one of the main non food causes.