Hello, the thing that strikes me is that many of your symptoms could seem to indicate a very serious Lyme disease infection. I know this is hard to test for, many have reported false testing results when they really do have the disease. But it does seem to parallel many of your symptoms and you may want to research this. Not saying you don't have mercury poisoning, I'm not diminishing the problems stemming from that at all - but you could have more than one condition contributing to your problems.
Especially the heart palpitations, that's what really caught my attention. And your headaches, neurological problems, eyesight, arthritis, fatigue, depression, dizziness/fainting, sleep disorders, pneumonia, nausea, etc. etc. etc.
I urge you read the following links to see if this information could be helpful to you: