Another case was a television producer who just didn't have time to get well from foot pain. His feet felt as though they would burn up. It turned out that he was low on vitamin B12. I did nothing else but give him shots. He learned to give himself 20 of them and his problem was gone.
Nutritional deficit is a common problem.
Another was a woman who had persistent fatigue and could not enter an exercise program. She turned out to be iron deficient, which is very common among women. We tested her for something most doctors don't, called ferritin. It was in the low to normal range. Then we gave her an iron challenge over six months with three tablets a day.