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This needs investigations as following;
1) MRI with gadolinium contrast
2) Magnetic resonance angiography (MRA)
3) Tilt table test
4) Carotid sinus massage
5) Electroencephalography (EEG)
6) Stress cardiac test
7) Total creatine kinase (CK) and heart enzymes; done immediately after the episode.
8) Following also may be done after the episode; blood electrolytes and blood glucose.
These should be able to zero down the cause.
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how old is he?
he could be having low blood sugar levels or low blood pressure? these are easily checked.
he could be having low blood sugar levels or low blood pressure possibly.
these can be tested for with simple finger glucose checks and blood pressure checks.
I would start there
he could be having seizures possibly, less likely
does he have a doctor he can see who can help run some tests for him?