Fainting is a common symptom of heat stroke. The reason this happens to many people is the lack of fatigue. The best remedy is to keep yourself hydrated and have proper rest.
I hope it helps, Regards.
Answer:
Immerse burned area in cool water.
But it doesn't mean you should apply very cold water/ ice cold water on the burn. Extreme cold applied to a burn can further damage the tissue.
The probability of that is 1 out of 2 u never know