Could not there be aspects of both?
Perhaps someone who has experienced a traumatic brain injury-concussion, might also show signs of PTSD????
Certainly, you have seen a neurologist and would keep up with good medical care.
But, at some point, you might have to seek mental health assistance as well.
I agree, a huge problem for one, might be a small problem for another.
Perhaps the way a person was brought up is an influence. Perhaps they don't have strong coping mechanisms. Or perhaps they don't have good coping mechanisms for certain types of situations. This is nothing to be ashamed of in the least.
The important thing, is to get assistance. That is what I think is healthy to do when we recognize that we are stuck...get helpl..make changes....move forward as best as we are able...
If you have not explored the possibility of therapy for you as of of yet, I would look into it.
I too like CBT therapy...but prefer therapists who are somewhat "directive," in their orientation.
You might look into books on spiritual growth...a topic of interest to you and one that no doubt you sense will be of help. Go with it.
Wishing you well.