Have you gone to a concussion center to see a neuropsychologist??? CT scans or mri will check for structural damage, but wont pick up concussion... I had similar symptoms after my concussion and am still struggling 10 months later...these are very common symptoms and they will get better in time...I was in a living hell for 7 months...My headaches were severe now not so much, but I am still tired a lot...the concussion center will most likely just say to rest and maybe try some meds...but from experience meds dont help this out much...concussions can be terrible...