While on the anti-yeast (or anti-candida) diet, calcium intake may be limited, so you should perhaps take a calcium+magnesium+D vit combo, calcium is best taken with magnesium + D vit to make uptake more efficient.

According to my understanding, yeast overgrowth happens always with mercury poisoning, because mercury in blood stream decreases immune system activity. You may therefore find that most of your symptoms after removal are caused by candida (yeast), and possibly other bacterias and viruses in addition to abnormally functioning thyroid and adrenals, regardless of what your doctor tells you (if you even bother to consult one).

I and some other people have experienced the 3-day delay after removing your last amalgam (if you should remove them all in one go, which is not advisable if you have many of them), when your body kicks in and starts detoxifying, which is a bit rough, but maybe less frightening when you know what is going to happen.
For me the change was dramatic, since I likely went from high adrenal hormones to low (based on symptoms), while the thyroid also had to scale its activity downwards.