I too had over active thyroid about 3 years ago, took medication for a year and I've been fine ever since (even though I had my amalgams replaced 4 months ago)
My symptoms included: feeling really hot all the time, having a ferocious appetite, eating all the time and getting thinner and thinner, my face seemed to freeze and I found it hard to smile, whole body shakes, nervousness, a horrendous stressed feeling all the time, increased energy and needing to do things really quickly- basically my whole system was on fast forward. Horrible.