Our expert says:
One would need not only to directly assess him ( so it would be useful for him to see a good local psychiatrist ) but to know exactly which drugs he was taking for the hypertension, etc. Some of those, alone or in combination, can cause depression, anxiety, and other psychiatric symptoms, though I can't recall coming across claustrophobia as such a reaction. Mood swings, aggresion, yes, possible.
The snoring pattern you describe is also more than ordinary snoring, and sounds very like Sleep Apnoea, which, because ( and its far more common than people think ) it includes a person stopping breathing for periods during the night, can also obviously impact on mood and behaviour.
Yes, seeing a good psychiatrist for a full assessment is important, as then a diagnosis or diagnoses can be clarified, and a treatment plan made taking into account his hypertension and any other relevant problems
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