Heavy metals usually don't inhibit bloodflow. What they do like to do is attach to the fatty acids that protect nerves (heavy metals can be lipofilic, aka, they fark up everything that uses fats to operate).
Good idea putting a half on the MSM. Lemon juice and cold-pressed olive oil, b-vitamins and magnesium oil should help with the neuropathy healing.
The pointer from the guy you asked about MSM, of avoiding gluten products is very important! Most wheat products are processed using glycosulfates on the plants before they're harvested. if you want something to fark up your whole system, it's modern grains. (sad bit true).
Best alternative is coconut flour, buckwheat (using soaking to get the anti-nutrient enzymes out of the dried seeds), etc.