I tried and failed when I went full bore with frequent dose chelation (Culter's protocol), and with the protocol my dentist used, based on Klinghardt's method with lots of garlic, MSM, chlorella, and ALA.

I am now using cilantro, chlorella, and the basic list of vitamins and minerals listed on this site. It continues to kick, so to speak, but at least this way it is manageable, and I am doing something about the mercury in my system.

Unfortunately, when I do too much and my body feels like a toxic waste dump I stop all chelation, which isn't doing any good because it isn't moving the mercury out.

At least now something is happening, and I mention this because in your case you are at least doing something about mercury. Good for you.