Candida won't ever go away with a compromised immune system. A lot of us do nutritional balancing (just google "nutritional balancing dr wilson") as a good whole body healing plan. This may help to heal some of the underlying issues.
You might want to go look on the chelation support forum too, many people over there use the 'cutler protocol" for chelating mercury. Mercury is nasty stuff, so be careful. I would think combining Nutritional balancing, cutler protocol, and some antifungals would be good - but research this yourself.