Heat strokes are nothing to play with, my son had one and I see it a lot on the boats I work on.

DRINK plenty of fluids, gator ade if you have it ( NOT ice cold but cool) Did you sweat profousley then didn't sweat anymore even though you were extreemly hot?

Place cool wet , NOT COLD towels around your neck and under your arm pits. You need to cool down without shocking your body so you have to do it slowly.

If you do not start feeling better soon, get to an emergency room.
Heat strokes are serious business.