"I am wondering what type of test would show my TRUE mercury level as I know the blood test will not. "

Nercury accumulates in the brain, liver, kidneys and thyroid. You could get organ biopsies and have mercury levels for each organ calculated from those, however that is not a good idea, and is not recommended.

Some doctors like to do a challenge test which involves measuring mercury excretion, then taking a large dosage of a chelator, and measuring mercury excretion after. Some have become much sicker after doing a challenge test.

Dental schools can be much cheaper than private dentists, however many will refuse to replace amalgams unless they are in bad condition. In NYC for example, NYU dental school charges only around 1/4 of what private dentists charge.