Can I tell you a truth? AS someone who gets hit in the head for a living, the thing is you cannot realize what damage was done because you will always be experiencing the current you, that current you will not remember what the old you felt. It is well known in my circles, you will never be yourself again and that shouldn't be scary but it should be understood. Your brain can only imagine the state it is currently in, it cannot imagine the state prior, damage happens and now your thinking moves a bit more lower than you previously know, but you do not know that now because this is your new normal.
Hope that makes sense.