I personally have a Traumatic Head Injury and after months of hospitilization, months of rehab, and years of disability I have returned to work. Saying this, I understand the effects of short term memory loss
like your son. His short
term memory loss may or may not be linked to him hitting his head, but that being said I don't know there is much you can do for him. You could have him evaluated, tested etc., but his memory will still be the same as mine was never improved after treatment.