symptoms?

I'm just curious what others have experienced in connection to mercury fillings. I have trouble with serotonin (seems to be getting lower and lower, and I have had to keep increasing my medication for it). I also have problems with obsessively eating Sugar and frequently experience "brain fog". I basically have symptoms of candida, which I've been trying to treat with probiotics, etc. Please let me know what I should be looking for in relation to mercury toxicity. Thanks!