My 16 year old has been extremely fatigued for a month - 3 blood tests have only confirmed that she had an incidence of mono at some point that can't be determined. blood tests have ruled out lyme, thyroid, anemia problems. the pediatricians we're using don't seem to have an answer. she was feeling a bit livlier over the past 5 days, but woke up again fatigued and "achey (achy)", mostly in her legs. I just want to know what my next move should be, as we're very frustrated.