"The raw thyroid nearly instantly raises my oral temperature from 97 degrees to 98.6 and it makes me feel a lot better...whereas kelp and iodine give me symptoms and actually make me feel colder for whatever reason."

Perhaps the high iodine dosage is causing bromine, florine, and other heavy metal detoxification?

http://www.iodine4health.com/special/metals/abraham_metals.htm