YES, I had that too! I had it before I removed my amalgams and for a few months after removal.

It was at the lower back of the head, almost where the area of the head is attached to the neck, and it was on both sides. This area was also tender to touch in addition to the draining/hallow feeling...... I had actually forgotton all about this symptom, but it bothered me a lot as I even went to a chiropractor and a physiotherapist before I discovered it was heavy metal related <img src="/ubbthreads/images/graemlins/crazy.gif" alt="" />