Sounds similar to the thinking expressed by my current Neurologist.

I was injured June 2010 - first Neurologist began the Migraine therapy with Amitriptylline and we escalated dosing to 200 mg twice daily from January 2011 to May 2012 - still no true Headache relief, except minimal quelling.

New Neurologist ( the other retired) began decreasing dosing of Amitriptylline and then we began Topamax to current level of 125 mg. twice daily (now), and Headaches are steady at levels of 2-3/10 daily. I know that the PCS migraine is there, and my headaches are also mTBI chronic headaches - also agreed to by Neurologist. We are remaining at this level of medication.

We are dealing with all my other symptoms individually over time, and occurence, to see which can be addressed, and which will take time and interventional therapies.

I understand now that my concussion/ mTBI is going to be a process of life adjustment as well as finding therapies and new lifestyles to adjust to.