My 14 year old daughter ( who was diagnosed with fibromyalgia last year) is experiencing muscle weakness in her legs, dizziness, extreme fatigue and problems with cognitive function. MRI s of the brain and spine are normal. Hypoglycemia has been ruled out. She is taking physical therapy twice a week. She walks most of the time with a cane or walker. At times she seems to be improving physically but then has a crash and gets worse again. We re having problems getting appointments with specialists because tests are normal. I m researching everything I can; can you suggest any possible causes or specific tests to run?