Not sure what your current health status is, and assuming you don't have to wait a month for scheduling, I'd probably do the amalgams first, would then do the mercury detox/chelation with fasting, and then deal with the parasites while again fasting. Just be sure to be careful and to moderate your fasting so as not to lose too much, too much too fast, or to detox too fast. Also, I'd probably stick with juice fasting for now, and save the water fasting until you've resolved your known issues.