Linda, you did say you are on a low carb diet? The fatigue might be at least in part due to large fluctuations in blood sugar levels. Instead of eating 2 or 3 large meals a day, you could try eating 5 or 6 smaller ones and see if this helps you feel better. eating cinnamon also helps to keep blood sugar levels more stable.
During chelation, my mood is often elevated, however I also often have much more physical aches and pains. Some claim that if the last few chelation doses on a ALA+DMSA regimen are DMSA only, then they don't have such bad symptoms between chelation rounds.
Are you taking molybdenum? I find that molybdenum helps greatly to minimize general chemical sensitivity. So does plenty of b vitamins.