Hello and thanks for the query.
As your son, didnt exactly remember what happened immedietely when he came home, its possible he may have temporarily lost comsciousness due to a concussion
. He also has some alteration of sensorium and lightsensitivity which indicates that you need to see a pediatrician
or neurosurgeon immediately to rule out any intracranial injury/ bleeding within the skull, etc. Hence, kindly take him to the Hospital as soon as possible.
Wishing your son a speedy recovery.