my father is 67 years old and is experiencing leg and feet pain. Mainly from the knee down. He also goes through spouts of feeling weak, drained, tired, no energy, and take a few days to recover. All his blood work came back normal except his muscle enzymes were high. He has had a muscle biopsy and we are waiting on the results from Emory in Atlanta. I have researched possibilities but as you may know the internet can lead you all over the place. I am curious as to an idea of what causes this to happen.