I did well with sweating (hot baths and mixing in epsom salts to aid sweating or mix of baking soda and sea salt (a cup of each). That can help. Exercise too (walking/treadmill). That really aided me! 30 minutes or so, 3 days or more a week.

Antioxidants - powdered vitamin C with bioflavanoids if you can. Selenium, vitamin E, milk thistle etc. Though you'd do well to get minerals too and probably B complex. Maybe a really good quality vitamin/mineral supplement too.

Diet is often essential. Avoidance of sugar/gluten/yeast products helped me from being so horribly poisoned/toxic. Inclusion of good quality fats like butter/extra virgin olive oil, organic coconut oil (if tolerated, though its' a powerful antifungal). Protein foods like eggs/meats. And if you can, raw vegetables, fruits, non gluten grain etc.

Here is something that may help you too. HEELS detox kit. This stimulates excretion of toxins and metals via lymph/liver/kidneys etc. This can be VERY powerful, so sometimes you may have to take less than what it says. You take drops in water and drink throughout the day. It really does work!

Those were the natural ways I went about aiding excretion of metals, but the only way I find to REALLY chelate more seriously, is with proper chelating agents and used according to Andrew Hall Cutler's protocol for less redistribution and tolerance and effectiveness (and safety).

But as you are having problems right now, you may find the other methods I have mentioned one way to prepare yourself for it and build yourself up a bit. A certain amount of metals will come out, but the ones in the organs/brain do require proper chelation.