What detox method are you using?
Some detox methods can redistribute Mercury and make you feel very sick.
Have you tried PCA-RX oral chelation spray avaliable at http://www.awakennutrition.com ?
I have found this has helped me better than anything since I was sick after Amalgam removal.
Also Whey Protein powder is a good option to take as protein is a defence against mercury the cystein amnio acid is sulpur bearing in structure and will aid in removing Mercury.
Selenium 26ug a day is important also as selenium will bind to mercury and make it unavaliable for obsorbtion. Flaxseed oil (not fish) each day is helpful as a brain protector and aider.
Colloidal minerals taken with the PCA-Rx carry a negative charge and will pull mercury out of its hidding place for the PCA-RX to grag and remove.
Buy a brand like Dr Wallach magestic earth or TJ Clark.
These helped me alot.