Its really hard to give you any tips, and you should not be asking for tips, because everyones body is different and everyone's response to a variety of treatments is usually diferent. We are all a unique case......

I dont know about the grapefruit seed extract - I think there are to many bloody things on the market for us to "buy". Remember that natural health is also a billion dollar a year enterprise........ Grapefruit will kill yeast and then could very well imobilize and shift the mercury in your body, not necessarily removing it unless you have a binding agent like DMSA or zeolite. But possibily your organs of elimination could be clogged and therefore you should work on this before anything, including amalgam removal.

Treatment possibilities:

1. Do you have adrenal fatigue? if so start with 5 mgs of cortef cortisteroid in the AM and 2.5 mgs 2PM. If after 1 month not feeling any better or any worse then double this amount. If feeling worse, then could have a severe liver problem and the cortef is not able to dissolve. So then start with 4-6 months of liver detox
If the cortef is working, continue for 4 months for a maximum or 18 months depending on your severity of adrenal fatigue. In six months if feeling better then start a multu glandular treatment - thymus, adrenal, pituitary, pancreas, thyroid - http://www.besthealthandbeautystore.com/page/1065337
Continue for 6 months

2. Liver gall bladder detox
http://www.nutritiondynamics.com/products/homeopathics/sarcodes.htm

3. heavy metal detox and liver support
dmsa, zeolite - milk thistle