I'm so very sorry this is happening to you. How awful.
When I was 12 years old I suffered a severe head injury and it affected me profoundly and still does even to this very day. I've read some articles in popular magazines [not scholarly research periodicals] that football players sometimes suffer cognitive deficits after traumatic brain injuries. I don't know that much about it. I really should read more since it relates to me too.
Do you think it would be helpful to you to be seen by a licensed neurologist?
I can certainly identify with you and sure you find answers and relief! ! !