Do you have migraine-type headaches? Or tension-type headaches?
I had daily migraines for about six months after my concussion. Then I was put on a migraine preventive (Elavil) which helped some, but I still got them a couple times a week. Also, the Elavil made me very groggy and dizzy.
Then I transitioned to Topamax. That worked better. Finally, I also switched to a vegan whole foods diet and used other natural treatments such as hydrotherapy and algal DHA/EPA to reduce inflammation in my body. After that, my migraines went away.
I do still take the Topamax. I tried to wean off it, but the headaches started coming back.
The other thing that really helped my headaches was vision therapy. Have you had a vision efficiency evaluation (different from a medical eye exam)? They will test how well your eyes work together. You can find a doctor who does this type of evaluation at
http://www.braininjuries.org or
http://www.nora.cc
Hope you're able to find some relief soon.