Lordy!
I've never met anyone who's had heatstroke! Frightening.
Glad someone looked after you! (I like to think that if I found someone on the train who was sick, I'd escort them home, no matter how far out of my way it was...seems the decent thing to do!)

Make sure you have your aircon on then on the weekend so Shep and I don't melt, too! :-p