I do a Quest Toxicology panel every six months through my Primary Provider. I've been getting them for 9 years. I don't love Quest, but I think something would have shown up by now.
Also, I'm very close to being better, so it would be hard to convince me. So I think the metal issue is largely a red herring, unless you have have been exposed to a known environmental or dietary source.
I think you need to eliminate pathogens. That eliminates inflammation, then the body begins to repair itself. I can testify to that.