Mercury can cause kidney problems. It might only be temporary though. Are you drinking enough water? Too much water might also be a stress on the kidneys so don't overdo it, but taking in enough water is necessary for detoxification. Bad smelling urine might just be the result of a diet high in sulphur foods. Asparagus seems to be the food that is best at causing foul smelling urine. I tend to eat a mostly natural diet, and if I am not careful about it, I don't get enough sodium. Those who eat plenty of processed foods though get more than enough sodium.

Do you think you are retaining water? When I feel the worst, I think I have a tendency to retain water, as my weight can suddly increase quite a bit. I think when the body is very toxic, it tries to retain water to dilute the toxins. Since you are having kidney pains, I suggest that you ask your doctor before consuming plenty of herbs that have diuretic properties. I am thinking about herbs such as dandelion, parsley, licorice root, etc. When I am feeling the most toxic, I get some relief from detox teas. My favorite detox Tea is Triple Leaf Detox Tea. it gives me the most relief. I tried a few detox teas, and that one gave me the most relief. If you are having kidney pain though, I suggest you ask your doctor first before using a detox tea, or before consuming plenty of dandelion, parsley, licorice root, etc.