Hi
These symptoms you are reporting may refer to injury to the frontal lobe of the brain.
These symptoms are very common in head injuries which lead to a drastic change in personality of the individual.
But the severity of symptoms are related to the type of injury, extent of brain damage, time to treatment after injury and so any factors.
Next Steps
In order to evaluate him completely, we need to consult online or offline, so that I can let you know with the next line of management