SandyMom, since you haven't gotten a lot of specifics in this thread yet, I can share some overview ideas, I'm not sure where you are in the process of learning about mercury toxicity (and I have a feeling we've been on threads together, I'm just really bad about remembering names w/o faces to match).
Have you looked at the supplements suggested at either the autism-mercury yahoo group (mostly aimed at kids) or the frequent-dose-chelation yahoo group (mostly aimed at adults)? Those are the nutrients that get depleted as we get sick, and some of the issues we have are mainly related to being nutrient-depleted.
Things like: B vits, esp B6 and B12 (but the group works together well), mag, zinc, folate, usually our balance of omega-3/omega-6 is really off so DHA and/or EPA supps are often involved, vitamin C helps, vitD is usually low (due to liver stress/overall oxidative stress? not sure on this).
When we start fixing these, we've got more work than most people--it's not just eating well, it's years of basic work in the body that we've gotten behind on, that's why some of the dosages are really, really high, far higher than normal/fairly-healthy people could handle.
For me, removing gluten and dairy from my diet seemed to take a significant burden off my liver--as best I can tell, based on reading and my experience with how I've felt, proteins were leaking out of my gut and my liver had to deal with them (they should, obviously, stay in the digestive tract til they're very broken down, but that's not working right in me right now). That made an impact, for DS too, in allowing our livers to work on more important things.
Adrenal and thyroid support (whether vit/min support or replacement supps or a combo) are usually involved, and doing something here can help you feel better, and also allow you to think better and make better decisions. Brain fog is a hard way to get through life and make choices.
As for things that mobilize metals, it took me a while to really appreciate that I was way far out at the tail end of the bell curve in terms of toxicity. The things that generally help most people (stuff you read about on general websites if you google detox), can make highly toxic people very sick, because our toxic loads are really high and our detox pathways are very impaired. So anytime you contemplate something that actually mobilizes toxins, check it out with a few sources that are focused on really sick people, and if you try something, try it lower and slower than most recommend. The general H&H forum, or TF, are places to start reading, and if you find a really good healthcare provider, that's obviously a great resource (but double-check for a while, to make sure _you_ agree) but look for suggestions tailored to the very-unwell.
ETA: I meant to add, you can get ideas within MDC, but then go outside to forums that are more geared toward people with high toxic loads, there are several chelation ones, I am partial to Cutler-style chelation because I think it's safest (given my lack of specific knowledge of how to do this homeopathically), and those sites have warnings on some stuff. You _can_ try some things they recommend against, but you need to keep in mind the balancing act, you've got the potential to mobilize a lot more than other people, so you need to have nutrients in place beforehand, and always go slower and more gradually than you think you need to.
FWIW, vitamin C flushes from Perque helped me...http://www.perque.com/pdfs/Pt_Ascorbate_Slush_FIN.pdf
I did them (read the doc all the way through carefully) while nursing and I think it improved the quality of my milk.
Modifilan (a seaweed product) I also took while nursing and I give to the kids, it's my go-to if I do too much and get a headache, body aches, like that. It stopped the headache I got post-amalgam removal. It's fine as a daily thing too, that's how I use it with the kids.
A few things that I think are only appropriate very late in the game, once you're quite a long ways down the getting-healthy path are cilantro (I haven't tried it yet), DMSA and ALA after amalgams come out. I'm sure there's other stuff. I haven't tried kombucha, but if you did, I'd start with very small amounts (totally guesstimating, maybe 1 tablespoon/day?) for at least a month before considering more, and only after I had improved my nutrient status (since those nutrients that we're low in are the ones we're relying on to get the mobilized toxins out).
Good site to read about liver function and nutrients, glutathione and methylation are big here, but really everything is connected, and everything becomes impaired to one degree or another.http://tuberose.com/Liver_Detoxification.html
I don't know if this was too general, I was hoping it would provide things to read about and start with.
on dealing with this, it's a lot of work.