Meshugga, please look into the viral component of hyperthyroidism and Graves disease. You may remember one of the US presidents, George H W Bush, developed Graves at the same time as his wife and their dog.
Human Parvo Virus 219 is implicated as well as several others. People often get Graves or go hyper when they are under great stress. Iodine was used as the standard treatment of choice at one time. But additionally, looking into the virus connection (get screened) and adding Vitamin A may help.