i have thought this also, theres alot of involvement when it comes to replacing thyroid hormone, like checking the adrenal status and getting it sorted before thyroid meds, which i had to do, or else i could never have taken armour, even though i have been on T4 for 13 yrs.
Jinx, if you decide to go this route go to www.stopthethyroidmadness.com, the people there will help you with test results and self dosing with armour or other thyroid meds and most importantly something for your adrenals first. i know for me, when i got exposed to mercury by not enough protection,i felt like you did,i believe the mercury wentstraight for my thyroid.
Dawn.