To deal with excessive body heat, you need to drink lots of water. You should also eat green vegetables as they usually help to control the body temperature. You can also eat fruits that have a significant amount of water in them.
Drinking lots of very cold water or eating frozen popsicle is the best way to cool the body down, because it cools it from the inside. Others things that help are; a cool wash cloth on the back of the neck, a cool shower, air conditioning, removing warm clothing and staying out of the sun. Hyperthyroidism can cause the body to overheat frequently. Take care