Fibromyalgia and chronic fatigue syndrome are more related to parasites, bacterias and viruses than mercury. Although mercury is often involved in such cases, it isn't directly causing the symptoms of CFG and fibromyalgia. There are people who haven't had a single amalgam filling or been otherwise exposed to mercury, but still have CFS or Fibromyalgia. These people probably have a poor immune system, and often get permanently sick from their first encounter of some disease normal people tolerate without much problems. Since mercury weakens the immune system, you can easily get the same trouble with mercury. This is why chronic mercury exposure is so dangerous.