boy I am getting to say the following line I like 3 times a day lately. Your doctor is an idiot. I would use curse words but I can't on this board. CAT scans and MRI's are not going to show the damage to individual neurons at that level. They are working on machines that will and we should see them within the next 10 yearsbut I have yet to meet a person whose concussion did show up on an MRI unless there was other damage done that would show my advice is always the same go to another doctor or a clinic that specializes in concussion and keep searching until you find one that believes and wants to help. People smarter than me will be coming along to give you more advice on different professionals to see and supplement regimens and a lot more. Good luck