those symptoms do not sound like copper and iron toxicity to me. They sound like an overworked and an overtaxed liver.
Personally, if I were you I would take a break from chelating, and do some serious liver support protocols. Liver support herbs, bitters, a few liver flushes, etc.
I would also do some Hulda Clark style kidney cleanses
Chelating mercury is extremely hard on the liver and the kidneys.