Our expert says:
Aspects of his background may accoun for part of this, as well as other factors such as stress ( at work or elsewhere in his life ). But he does indeed sound as though he seriously needs to see a good local shrink for a proper assessment of this symptom, and for treatment to learn how to avoid such episodes which are not merely unpleasant for him and others, but potentially dangerous, ditto.
The trouble will be that of course there is no way of helping until he recognizes that he does have a problem here, and until he seeks help and sincerely and actively works with the shrink. Apart from yourself urging him to get the help he deserves, Pop's suggestion is a good one to see if someone he respects and listens to, will make the same suggestion
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