I know you're on to something because for many years I've known about the relationship between Candida & mercury, I also recently read that Candida may be responsible for gluten intolerance, at least in some cases, my father had celiac but he didn't have any symptoms of Candida, but I believe he did contract sprue which is an infectious type of celiac.
In my case, well, I had a "mouthfull" of amalgam fillings until 2003 but all I did was take selenium and later on large amounts of iodine for a short time. Chelations can be very expensive, I once contacted a doctor who did it in FL and it was way out of my league, and if anything my financial situation is now worse so, needless to say, I have not done anything about it so I could bet my ongoing problems with Candida are due to the remaining mercury in my tissues. Sometimes I feel resigned to continue to live with it as I'm not getting any younger and someday we'll die of something, I just hate the thought that my life could've been better if all that metal had NOT been put in my mouth in the first place! To think that I've gone through SO much missery like depression, anxiety, sleep and hormonal problems caused or related to hypoglycemia, hypothyroidism, adrenal fatigue, etc., not because of anything careless that I did to myself but because I trusted what was being done to me, is a bitter pill to take.