Heat Stroke - Do you have to go to the hospital?

Ca

I got heat stroke yesterday - I passed out and experienced horrible nausea and confusion. I really dont remember a lot about what happened.

I was at warped tour and I was seen by a medic - but I started to feel better after about 30 minutes or so.

Im just worried because whenever I see anything about heat stroke it says to call 911. Should I have gone to the hospital? Are there symptoms I should be watching for?