Consider candida as a possible (probable) part of your overall illness. Many people with mercury poisoning suffer from yeast overgrowth which can cause the problems you mention and many more (sometimes confused with or overlapping mercury symptoms).

Treating candida is essential for many people wtih mercury poisoning. Mercury maybe the reason for yeast overgrowth, but is often causing only some of the symptoms. Many people are multiple toxic because mercury depresses the immune system and allows for other toxins to cause problems as well as yeast overgrowth (which releases its own toxins). Treating yeast can enable the immune system to improve, thus helping your entire body, including fighting the mercury and detoxing better.

To treat yeast, you'd be advised to go on the candida diet. Exclude all sugar, yeast, and wheat/gluten out of your diet COMPLETELY. Partially does not seem to work. You may need to also reduce or eliminate high carbohydrates too (all grains, fruit, honey, potatoes/corn/carrots/peas/beans etc) and concentrate on low carb foods such as eggs (free range) meats, low carb vegetables, acidophilus yoghurt, raw seeds, nuts like brazil/almonds etc. You "may" be able to handle some non gluten grains and higher carb veges and limited fruit, but you may not. Depends on how severe the yeast is.

If you haven't done this before, the response from the diet change may create a die off effect from the yeast dying off and you can feel worse for a time. Toxins are also loosened and released, so you may experience a healing crisis from this and feel worse for a time. Some feel worse for a few weeks and then experience improvement (sometimes a dramatic improvement). It is worth doing believe me. Even if you do it to see if this is part of your problem.

Epsom salt baths are also helpful for weak/sore muscles too. A cup or two of epsom salts in a hot bath. Not only does this help provide magnesium (which you can also take orally), but will aid elimination of toxins via the pores of your skin as well.

I would take calcium and magnesium in equal ratios and zinc too. I would also consider taking other supplements that may help with the mercury like antioxidants - vitamin C, vitamin E, selenium and probably a good multi vitamin/mineral as well and essential fatty acid supplement like fish oil (mercury free).

Butter is very good too and Hal Huggins recommends butter for mercury toxic people. It is very healing! And he believes it helps chelate mercury. Not sure on that one, but it's worth including anyway. Extra virgin olive oil and organic virgin coconut oil are also good fats to have. Plant oils like canola oil etc should be avoided.

I hope this is helpful, I found it was to me!