I had a similar issue where my heard would just start pounding extremely hard when I stood from a seated position. I also felt light-headed and nearly lost my balance. My hear felt like it was weak.
Of course, this symptom, along with numbers other vanished when my amalgams were removed in July of 2000.
I also has numerous emotional issues that vanished along with poor memory, which has improved to a point where it is not better than it has ever been in my life.
Huggins goes into this a little in his book (that you already read) It's All In Your Head.
Dr. Haley also talks about the relationship between mercury and Alzheimer's. Here's an interesting video:
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