It's common in mercury poisoning to be sensitive or intolerant of many medications/supplements. The way the mercury inteferes with the way the body processes food/supplements can be very bad to where the person can almost react to anything and everything. anything you take or try and somehow you wonder why you feel worse, or breakout as you are.

Along with mercury, is usually overgrowth of candida yeast inside the body. Normally kept at appropriate levels with a healthy immune system, the yeast is able to get out of control in an environment that is unhealthy (eg mercury) and then spread and give out its very own toxic wastes which add to the mercury toxicity.

Many of us have not much choice but to follow a strict candida diet in order to starve out some of the candida overgrowth, allowing the immunity to breath a bit easier, thus giving the immune system a boost and then mercury is easier dealt to. Candida can cause allergies and intolerances as well as the mercury.

Candida also absorbs mercury and can hold its own weight in the poison. Starving out candida will produce symptoms and may make you sick for a time as it begins to die. But it's worth it. Killing it outright with antifungal use can be dangerous, as antifungals act powerfully and usually blast the yeast cell open, releasing the contents of the yeast in large amounts (which often contain mercury), thus poisoning the person further. Not recommended, but sometimes has to be done to treat an acute case of candida.

Just a suggestion. I would definitely go on diet of no sugar, no yeast and no gluten grains, to allow some of your body to get at least a wee bit healthier (if you're not doing this already). It might also help your gut and might help the supplement intolerance. But obviously mercury is at the bottom of it.