Amalgams are indeed a big issue BUT first remember your body needs to be in a better shape to be able to chelate. I still believe you are too wired too weak and sensitive now to start this.
All your symptoms show low adrenal power and liver function. You need to recover them first to be able to chelate - chelation is a long and exhausting process - the usual method I believe is too harsh for our body.
Please ask people with SIMILAR experience or you'll be more bedridden. Try writing to Onwards user is a she who recover from a similar but worst situation. Including Amalgams and Depression etc.
People are great here on cz trying to help but it's your body your perception of it that is giving you the best feedback. I would wait with Amalgams and chelation until I'm better. And btw there are also other forms of chelation more gentle than classic ones.