Hi dizzeerascal,
I had the same urine test as you for heavy metals. Was yours through Doctors Data? I did a lot of research prior to getting this test and believe it is the best way to test for toxic metals. Of course, I really respect my doctor and may be bias because that is the only one he will use. He is very big on research and specializes in these kind of treatments.
I took 300 mg of DMSA and collected the urine for 6 hours. I also did the test prior to that without taking the DMSA. Did you do the pre and post tests? The pre test would most likely indicate what is in your body from your amalgams and diet. The post test will pull out what is being stored deep in the tissues. I had all of my amalgams out for almost 5 months when I took the test. Here are my scores;
Pre test 1
Post test 14 (high levels of mercury)

I did about 4 months of chelation, taking Detox Max with EDTA and DMSA. It was only every other week, but I took rather high doses compared to what other people write about. 300 mg of DMSA every other week. I also had about 10 FIRS sessions at 30 minutes each and drank tons of greens shakes. These were my scores after 1 year of healthy dieting and the 4 months of chelation.
Pre test 1.5
post test 2.5

It is possible to get rid of the mercury, but I would recommend that you get the amalgams replaced first. I was on a very healthy anticandida diet for over a year before I even had them out. It is important to have good digestion and elimination before trying to chelate. You do not want to have it redistributed back into the body. Potentially somewhere that would give you worse symptoms.

Let me know if you have any questions. Also, if you don't mind, what were your scores on the test?

chigirl