RayGee: I think candida may be an issue here. In that case you have typical symptoms such as a white coated tongue, skin rashes or itching skin on head. Typically most people who have been mercury poisoned have a weakened immune system which has let the candida spread within the body. It causes commonly brain fog, chest pain, rapid heart beat, constipation, joint pain, and in fact many other things like mercury does, and you get some reactions to common supplements.

It's hard to tell whether the symptoms thought to be caused by mercury are in fact those caused by candida toxins, which I think many make a mistake about. However, you'll know about this when you start an anti-candida diet, it should help quickly, at least it helped me.