The body has very strange reactions when exposed to large amounts of mercury...such as having your amalgams improperly replaced. If you got them improperly removed, I wouldn't be surprised if the dentist left some mercury in there somewhere, as he probably didn't even believe it was dangerous if he was taking them out without precautions.

Zinc personally doesn't work for me. It did for a little but I think I apparently got enough because now it just makes me tired and fatigued when I take it, and I feel pretty energetic if I don't.

I personally would not worry about how you reacted to stuff before and just pay attention how you do right now. You obviously are reacting to your recent attempts at chelation with ALA so just keep it up and I think you'll help excrete mercury that was stored in your body. I know its confusing since you used large doses before, but mercury really has some strange properties and effects on the body.