thats so terrible, personally i think teachers should go on a course, and know how to treat diabetics, ashma people, epelipsy , etc so they know wot to do in such cases !! is there nothing you can do

like take it further

at the end of the day, your son should not been left alone !! you should take it further and prehaps it wont happen again. its so annoying, half the teachers these days dont know wot there doing!!
xx