I am feeling quite sick now. I did a few rounds of chelation recently and feel very run down. I plan to skip chelation this week.

Since you can't chelate now, perhaps you should do a one month parasite cleanse then try chelating again after that? If your body is toxic from parasites and/or candida then you won't be able to do chelation. A parasite cleanse with wormwood, black walnut green hull extract and cloves is not just antiparasitic, it is also very antifungal. are you on a low carb diet? Did you eliminate sugar and alcohol from your diet? Detox teas, selenium and molybdenum supplements may also help with detoxification. Can you tolerate high sulphur foods?