I've been mostly in the same situation. I still have some amalgams (have had most of them replaced). In my opinion, the best thing to do is to support your immune system as much as possible i.e. take vitamin c. One problem I have is that I react to citrus, and so I'm just about to try a citrus-free vitamin c.

Cutting out caffeine, limiting sulpher foods, and drinking mostly water on a daily basis may help with the symptoms. Cutting out dairy may also help. This might include eggs, which some people react too.

Some would recommend vitamin e and selenium but I think there is some debate on those. There is also debate on alginate. The best thing is probably to find out what works for you.

I mostly do it through diet and vitamins - I've found it important to get at least RDA of B12, which I take for a general multi-vitamin. Organic food is better than processed, and some people have also found a gluten free diet to be helpful.

Magnesium can also help a lot, although there are many forms of it, so again it's finding the best.

These are just some things I've learnt.