Joe,
Purely from the anxiety perspective, not taking into account the mercury or candida aspect I have some advice for you. Its things Ive found out through trial and error myself over the last couple years...

Magnesium supplementation. Either magnesium glycinate or magnesium taurate (whatever you do, do not buy mag. oxide which is most common) Start with 400mg a day and give it a few days.

If you drink milk, make sure you are getting some mag. at the same time. Ideallly get your calcium from supplement or other foods.

B1 and B6 in moderation. Too much can make you have more energy and therefore mimic anxiety.

Meditation. John Kabbat-Zinn has a awesome book called Full Catastrophe Living and a supplementary meditation cd that is really reall good.

Running or other aerobic exercise.

Also get your cortisol levels checked. Get yourself checked out for Mitral Valve Prolapse, and get the T3 and T4 thyroid levels checked. The standard thyroid test done through the blood chemistry panel is not reliable.

Theres more, but these are the basics.