Hi, in regards to adrenals and thyroid, or any glandular/organ function, mercury can cause havoc, as can candida. You may find this link interesting as it deals with the natural aspect of helping healing by proper diet and supplements/fats.
http://www.healingnaturallybybee.com/articles/menu4_7_1.php

That plus amalgam removal and proper chelation maybe helpful to what you're suffering. I would look over the articles on that site because it is very helpful to the overall body and what to eat to aid healing and detox. It does not address the specific mercury chelation, but does believe that given the right foods and eliminating the bad, the body can start to heal itself from many problems. The lady responsible for that site who has studied for years on all aspects of diet/health etc, believes that her diet and supplements can aid the body in chelating heavy metals.

Though I agree with her to a point, I feel that some of us are more poisoned than others and will likely need a specific chelation protocol (after amalgam removal). As I dont think diet alone is enough personally.