You are not alone - I have the exact same problem.

Finding a good therapist is a good start - one with experience in theese problems, who you trust.

When you have been symptome free for a while, and I dont see why you shouldnt be totally cured, you will forget about it, and move on -I have a colleague who suffered for 3 years and who are totally cured now. He says he rarely thinks about concussions anymore.

Be patient and think positive(I know thats easy to say) - anxiety is counterproductive.