"My ND is not allowing any more dsma until I have labs done on sulfation pathways because of the severity of my redistribution symptoms. My lead poisoning is worse than my Hg poisoning, and she is recommending edta to remove some lead first before doing the dmsa again, after the pathways are checked. What do you all think?"

Sounds like a good idea. DMSA scares me. Using EDTA wouldn't bother me. One thing people need to keep in mind is to take extra mineral supplements when chelating. Chelation doesn't just remove the unwanted minerals, but also removes some important minerals.