Chronic fatigue syndrome, fibromyalgia, and multiple chemical sensitivity. These three have been linked to mercury toxicity.
Chronic fatigue is also related to the adrenals. Have you looked into that? If the adrenals are burnt (which sounds likely in your case), toxicities can build. Mercury, cadmium, lead, arsenic, beryllium, copper etc. I've also read that to overcome thyroid issues, fibromayalgia, copper overload, and some other conditions, you have to fix the adrenals first. I've also read you don't want to detox until the adrenals are first addressed, otherwise it can make the issue worse and detoxification harder...
I still say that copper overload isn't that common in most people
I hate to keep saying this but not according to Ann. She believes it is a common problem. She experienced it first hand and discovered a lot of her patients had it as well. A lot of factors go into copper overload, not just eating lots of nuts. You should really check it out. You can always get it at your local library if you have money issues. It's really a eye opener.
I think after what you've told me, it sounds like you need to try a new approach.