The key is to stay hydrated, so if you do overheat, you will sweat. I have taken large doses of MDMA and monitored body temperature with a thermometer at home. As long as you stay below 100, you should be good.100.0 and up is worrisome. The highest I ever recorded was 99.5 I think and I was rolling face sweating profusely. Stay in a cool environment, in the 60's and low 70's. Stay away from places that are 75+ F
if you overheat - immediately go somewhere cool, ventilated, with a breezy draft. splash water, turn on a fan, stand next to an AC vent. drink a bottle of water. sit (or lay if really really hot) down