This might be an inetersting bit of info. in the whole picture

Mercury and Immune System Repression

"Mercury is absorbed preferentially by yeast cells, bacterial cells, and molds. In fact, these types of pathogens are present in our body "by invitation" of our immune system. These organisms absorb phenomenal quantities of mercury and serve the supreme purpose of keeping us alive -- keeping the mercury from killing us.



lots more such good reading here, including why going after candida with a vengeance is a counterproductive and dangerous prospect:

source:

http://www.dreddyclinic.com/mercury_detox_procedures.htm


This would lead me to hypothesize that OP is in fact pulling out mercury that is in the system. With that in mind, I plan to break my fifteen minutes up into three sessions.