It must be doing something because I know the kidneys can ache when mercury is being detoxed. I've had similar with DMSA and even on a good healthy candida diet, that can also be enough to aid my body is pushing more toxins out through the kidneys and other areas. hence the heavy achy feeling that results.

Sounds like you're responding ok to these products and if they seem to be working? I'd continue. I know some do very well on chlorella, so if it works, great. I found my system could not handle it too well, so I switched to Andy Cutler's protocol. Over time though, the more mercury removed, the more healing takes place and the more normality is restored to where you just don't react as much anymore to mobilising/chelating products.