From the sounds of your symtptoms there may also be a metabolic component ( which we often find) in relation to your post concussion syndrome.
We can say " rest" until the brain heals but sometimes it just doesnt happen. Get some basic bloodwork, as a start and then go from there. The Brain needs only 3 things to be healthy: 1. oxygen 2. glucose 3. activation
If for example we see decreased red blood cells we would need to boost that in order to deliver proper oxygen to the brain. Cheers