It is quite common for an MTBI person to exhibit signs which appear to mimic Attention Deficit Disorder. So much so that they are diagnosed with ADD instead of the broader MTBI. Many are even medicated and treated with ADD-specific therapies.
If you did not have clinically-diagnosed ADD before your MTBI, then it's entirely possible your symptoms of MTBI are mimicking ADD in part. This is what I call 'Fake ADD'.
The signs are there. Buzzy attention span, nervous feelings, short attention to detail, easily distracted, forgetfulness, hyper demeanor and all the rest. Yes, lots of symptoms are shared with the ADD diagnosis.
Curiously, however, your Fake ADD symptoms can go away with classic MTBI therapies, such as CranialSacral Therapy, Vision Therapy, supplementation. The same therapies are not so effective for classic ADD.