If you dont have amalgams anymore, do a round of chelation with DMSA. If you get increased symptoms, or if you feel much better during the round, you know you have mobilized and/or eliminated mercury. Most mainstream Drs will probably know that if you don't have any toxic heavy metals in your body, taking chelation meds won't change how you feel.

Also, the porphyrins test is recognized by mainstream medicine as confirmation of lead poisoning (its an FDA approved test for such), and there is research published about the pattern shifts for mercury and other chemically induced diseases.

If they won't order an ASI saliva test for the adrenals, have them do a 24 hour cortisol. If low or high, it shows something is up. Be careful though, if high they will tell you have major depressive disorder, which is associated with high 24 cortisol. (Indeed MDD is one of the many things associated with high cortisol - so if its high it doesn't tell you much except your body perceives its under a lot of stress).

IMHO, the thyroid blood tests are actually accurate, as long as they order the right ones. Make sure they get TSH/FT4/FT3 and RT3. Also, make sure they interpret the T4 and T3 numbers in light of their own ranges. Most people just look at the TSH, but if you have central hypothyroidism (due to pituitary problems, ie mercury, or adrenal problems) your TSH may not be all that elevated, but your T4 or T3 may be reduced. If its adrenal issues mainly causing problems, your conversion from T4 to T3 or your T3/RT3 ratio may be weird.

I'm not a Dr., but in having all the testing I have had, I have figured out at least that much. Good luck!