13 year old daughter with strange syptoms(symptoms)

3 months ago, my 13 year old daughter fell asleep on her bed doing her homework and woke up on the floor in extreme pain. When I found her, she was confused, disorientated, dizzy, and in a lot of pain. Her bed is not high, so I put her to bed and checked on her throughout the night. Since then, she has suffered tremendous headaches, extreme fatigue (she sleeps 17 hours a day), occasional nausea and vomiting, and loss of cognitive ability. We have been to many doctors and she has had many tests. She has normal neurological exams, 2 normal EEGs, 2 MRI's that showed something, but they tell me it is probably just a normal variant and they will repeat the MRI in 6 months to double check. Her blood work has all been normal. She has suffered 2 concussions earlier in the year and they suspect she got another one falling out of bed...But no one can tell me for sure. They also suspect seizures, but I have yet to see one and her EEG's are normal. Has anyone ever heard of anything like this? It has been 3 months. She can't go to school. She used to do every sport - she loves sports! Now she can hardly move.