First off, if you in fact had heat stroke, which I am not saying you don't...Chances are you wouldn't be posting, but laying somewhere tits up blowing snot bubbles....heh heh heh
Most likely you are in fact having a bit of heat exhaustion....Cool clammy skin, chilly, goose pimples, hot, muscle fatigue and or cramps..etc.
Heat Stroke is SERIOUS and life threating...Hot, red dry skin, may or may not be coherent, skin will even be hot to the touch...For this, you transport to the ER quickly...IV's will be induced, and they will check body temp, and probally keep you in intensive care overnight and through the next day....
Heat exhaustion...Loosen clothing, place in the shade, give sips of water, take a cool cloth and wipe the head to help lower body temp. and I would have them taken to the ER just to be sure....
Comming from the Ranger's and having a secondary MOS as a Medic, I have been on far too many tank trail death marches in the mid July Georgia sun....Seen it all to often my amn...
Take Care and good luck....
Ranger