Our expert says:
From your description, it sounds as though he was hallucinating, and there can be many causes for this including drug reactions and side-effects, and fever from whatever cause. Was he, for instance in a malarial area ? Not likely to be due to simply being away from home. What he needs, urgently, is to see a good general doctor for a complete physical check-up, and if nothign physical is found wrong, after an examination and tests, then he should see a good local psychiatrist for another full assessment. This is not the sort of symptom opne can simply ignore, and demands a thourogh medical and psychiatric assessment to see if anything is going on which needs treatment
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