There is a small area of the brain that connects faces to names. You may have injured that area in a way that the DTI does not show. A Neuro Psychological Assessment could help identify your memory and cognitive dysfunctions and would usually be able to tell if they were a physiological injury or psychological struggle.

Mental illness would not be causing these symptoms. Depression can slow some processes. An NPA would look at all of the possible issues.

The question is whether there is a treatment for any of your symptoms.