I am 62 years old.  When I was 10 yrs. I fell off a small building and hit my head on a brick.  I cant remember much about the accident but I was bleeding and my brother took me to the doctor. In those days in Georgia, it was much prejudice and the treatment was sewing the womb.  Thats all I remember.  I have been having symptoms for years.  For example, headaches, numbness but the most noticeable is when I talk people often ask me what did you say.  It seems as if I say something I dont mean to say, and I dont know I said it.  My sister told me last night that I jump from one subject to another.  Maybe I am saying something that I dont know about.  I have a job and I have two degrees but I believe that the old head injury are reasons I cant remember past history.
Well it is difficult to say whether that old injury has left any brain damage or not. There are many other causes to headache and you don't specify what do you mean by numbness. Perhaps brain imaging with CT or even better MRI would be useful to show remnants of that old injury or some other cause for your symptoms.