Why do I throw up and become sensitive to bright light? Also. Why do I get massive headaches & wanna throw up when my body gets too hot?

Migraines or other. Migraines are a very common cause of this type of symptom. But reactions to heat may lead your doctor down a different path of workup and diagnosis. Make sure you mention this symptom to your doctor or neurologist.
Migraines? You need to be evaluated for possible migraines. Heat can sometimes trigger neurological symptoms. Ask your regular doctor about this.
Migraine. It sounds like you are having migraines, which can be triggered by light or different temperatures. See your family dr. Or neurologist and they can commonly prescribe you medicine to help shorten the duration of symptoms as well as prevent the migraine.