If I were you, I'd try a low sulphur diet for a few weeks and see if you feel any different. Sulphur is good for detoxing because it mobilizes mercury, but when the sulphur bonds break—which some do—the mercury can be redistributed causing more symptoms and damage.

Either way, I would hightly recommend daily doses of algin to protect against mercury redistribution, especially when you're on a high-sulphur diet or detoxing in general.

I consider algin the single most important mercury detox supplement. Here's a link if you're interested:

http://onlythebestherbs.com/Products/Algin/index.html

Let us know what happens.