You’re not crazy!! Concussion is a huge factor in Brain function as you have now discovered. Studies are really only just coming to light because of the NFL player studies. Traumatic Brain Injury can happen in the slightest of accidents. Dr. Daniel Amen has done a lot of work in the NHL study and has a ton of good information on concussion. Keep resting your eyes if you have frontal lobe injury and minimize time on computer because it slows healing. It takes a lot longer than you might think to heal. Our brains are the consistency of soft butter, so they can bruise very easily.
If you have the means, you can get a SPECT image done to see if any of the concussion has left permanent damage, or if the medication and rest will rehabilitate the areas affected. It shows areas of function or damage. At least then you can know what you are dealing with. Amen Clinics do these scans but possibly your Neurologist can order one as well.
Take care and heal.