Did the muscle weakness start when you started DMSA, or did you have it before?

Some supplements you should take to help relieve muscle weakness are creatine, carnitine, vitamin B12,other B vitamins, iron, calcium, magnesium,zinc and vitamin D. If you diet is not high in sodium then you should increase your sodium intake, as many do better on a higher sodium intake(don't overdo it though). Also make sure to get enough potassium in your diet. fuits, vegetables, and milk and yogurt are high in potassium.

If your muscle weakness is too great, then stop the chelation round. Adding ALA will give much more side effects than DMSA alone. What dosage of DMSA are you taking? Perhaps you should consider doing the next round at a lower dosage?