" Might the taste be a sign of its dying?" Most likely- candida grows on mercury and often the two get to be evacuated together.
Furthermore, the fact you got rid of your Amalgams implies a lot of mercury leaking in the process PLUS a history of your metabolism getting 'rid' of nercury by storing it in your bones and other tissues to save your bloodstream from turning to acidic, so there will be a lapse of time where you will still get rid of it.

Zinc and selenium are important antioxydants against mercury oxidifying action. When mercury is in circulation it oxidates : it steals an oxygen atom from the surrounding cells, thus rendering them inefficient. To neutralize mercury you need antioxydants, so make sure you use them, just to prevent damages during the healing process.
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Jhan