Can I ask how you were exposed to mercury?
The first thing I found was, after having first dismissed it as esoterics when I found it on the net, that I had a candida problem. Proven by the significant immediate effect of taking Nystatine (anti-fungal) and a doctor confirmed it. Later I even got Fluconazole, an internal antifungal, again with huge effects. Just an aside, funnily enough, the warts on the sole of my feet that every doctor would say were caused by a virus disappeared by 95% after Fluconazole.
Anyway, I learned Candida never is a cause but itself just a symptom, and since I had none of the conditions that are listed in the text books that might cause it I had to continue looking. Heavy metal poisoning was one of the only options that would explain the Candida, but also everything else. And I had only one possible source: amalgam fillings.
When the tests confirmed high levels of mercury in my hair as well as in my urine I still was not completely sure: It was high but not high enough to explain the severity of my issues. The doctor I went to said it was high enough to justify starting chelation, but I must have something else. I had the remaining three fillings removed with special equipment and protection. I had had three or four removed decades earlier without protection, just normal drilling, at the beginning of my CS study, and now something made sense: At the time I had suddenly, out of nowhere and pretty much overnight, developed almost-asthma level pollen allergy, and for half a year I had severe problems with the right leg joint. I never went to a doctor for the joint because the symptoms clearly showed me it was not "physical", I can't explain it with a few words. I also developed severe insomnia and - as I understand now but not at the time - "dumb". I had always been good at math, for example, but suddenly it was a problem. Stuff that today, after all my chelation, again looks very easy to me. I still passed and I was still very good at everything more practical so getting through the study was no problem. At the time I completely ignored all those sudden issues and took it as "that's just live".
Everything started to improve greatly during the first year of chelation, and after the fifth or so DMPS treatment in the following weeks the tissue around my right-side thyroid became very active. That was very curious, because I had had a double-sized right thyroid with a nodule for at least two decades, re-diagnosed just a year prior. Recommendation back then was surgery to get rid of the nodule. The tissues in that area became active after two or three DMPS treatments. I went to the endocrinologist again when I felt nothing else there. He did an ultrasound, and when he was done he started casually looking through his notes and became more and more agitated. He asked me to lie down again and he repeated the ultrasound, right side only this time. At the end the result still was this: Thyroid size nearly completely normal, and the nodule had disappeared completely. That was the point when I actually believed that yes, I had found the source of the problem.
Regarding an even more clear proof for amalgam fillings as the cause:
After about a year the doctor wanted to make an injection in to my buccal mucosa. It's just mucosa, so you don't need any force, but his needle ended up deep inside jaw bone. He found several places where the needle easily penetrated into bone. All those places where where amalgam fillings had been for two or three decades. He injected DMPS and just like in the thyroid area the are began to "work". Very actively. A year later the needle could not penetrate anywhere any more. The jaw remained a very very active area though for years, and it still reacted to chelation. An aside: The are had been OPG x-rayed a few times in the years before because I had finally gotten my crooked teeth fixed and jaw extension surgery too (now I have perfect bite and teeth, wonderful!!!). No doctor ever saw anything in my jaw. One wasn't sure about seeing a tiny shadow near one root - the one where I had the most issues and that was the most active later during chelation - but didn't take it serious enough and didn't follow up (when patients don't complain why would you if it's so subtle). But bone that can be penetrated by a needle easily is very broken. This shows how much (more) broken something has to be to show up even in an OPG x-ray.
My doctor never found anything else and now he too thinks that the only problem there ever was were the amalgam fillings. A lot - a lot! - of very interesting stuff happened to me, the chelators only paved the way out and started it, 99% of the actual work was done by my body (most chelators only work in extracellular space anyway). For example, there were three months of nightly 3-4 am kidney pain, but after the nephrologist found that despite elevated protein levels in urine there was no sign of kidney disease I didn't worry about it. It fit into the pattern of stuff happening at various times all over my body and my brain, a new phase starting every few months in another area of the body. For those three kidney pain months I simply got up when it started at 3 am or so, went to bed when it stopped at 5 am and slept until 10 and still got my sleep. No problem.
Even tough I'm a CS person, I actually have a background not in medicine, but (for fun and out of interest) I've also have many courses in biology, chemistry, org.chemistry, biochemistry, anatomy, physiology, neuroscience, several courses in each. I don't care about pathologies, I only wanted to understand the basics of biology and life and of human physiology.