Hi, thanks for posing your query here albeit no responses have been forthcoming for so long. I am surprised you never received medical attention for a significant head injury
during your teens. The best thing I can suggest is for you to meet a good neurologist
or a physican with an interest in neurology. You will need a thorough assessment to ascertain the actual problem. Neurological deficits of varying nature may occur as a result of past head injuries although you will need to be seen by an expert before such an assumption could be made. Best Wishes. Take Care.