Do you have a history of food and especially chemical sensitivities--odors in perfume Dept, diesel fumes, poor tolerance for meds and supplements, etc?
Adrenal and thyroid problems along with immune system weakness can have heavy metals as an underlying cause or contributing factor.
In one of his books Hyman says he went to ten other doctors before someone realized mercury was involved.
Most people in heavy metal detox groups report adrenal related symptoms, increase in fatigue, reduce stress tolerance, reduced intellectual performance, mood struggles among their list of symptoms. You'll see the symptom lists under the 1000+ hair tests here. http://livingnetwork.co.za/chelationnetwork/hairtest/hairtest3/