Hello! Welcome on Healthcaremagic! His symptoms could be related to a cardiac arrhythmia or low blood pressure could cause such episode. Seizures, can not be excluded either, although he was aware of what was happening. For this reason, I would recommend consulting with his GP and performing some tests: - complete blood count for anemia - an EEG for seizures - a heart rhythm Holter monitoring coupled with a cardiac ultrasound to examine his heart and exclude possible cardiac arrhythmia - blood electrolytes for possible imbalance - thyroid hormone levels. Hope you will find this answer helpful! Best wishes, Dr. Aida