I think a lot of it has to do with our immune system. I spoke to a holistic dentist once about the problems with root canals, and his response was that he had a couple but he didn't worry about them because his immune system was strong enough to handle them. I would imagine the same goes for amalgams. That said, I would be reluctant to get any more root canals, and no way would I get any more Amalgam fillings.
Anyway, glad you are doing well ECParent. Curious about the baking soda/ Colloidal Silver for brushing. What proportions of baking soda and silver do you use? I just started with Colloidal Silver and I may do that.
For Depression you might try something like SAM-e or 5-HTP. I find just going for a nice long walk always uplifts my mood. Yoga helps too. Going to stand on my head for a bit now. :)