Chelation without large doses of Iodine is useless. I was one of those that spent thousands on all available chelation products. Only once I introduced Iodine in sufficient amounts did it shake out the mercury/lead.
I also have lyme, the lyme parasite holds mercury and killing lyme is a constant cycle of killing lyme then cleaning up the mercury.
This means that for all those years that I had DMPS challenge tests and hair analysis for mercury they always returned negative since the lyme held the mercury.
Unfortunately this goes beyond the simplicity of what most consider adequate mercury level testing...