You might want to read this (sorry, long) article. This woman detoxed using homeopathy, having tried everything else. But it sounds like you need a very experienced practitioner.

http://www.wicfs-me.org/mercury.htm

My natural health practitioner also detoxed with homoeopathy, taking mercury as a remedy (as part of an overall programme). She told me it gave her the most horrendous symptoms - nightmares, suicidal feelings, depression - but worked. Good luck.