Hello! Welcome and thank you for asking on HCM! I went through your question and understood your concern. His symptoms may be related to epileptic seizures or to a postprandial hypotension. Epilepsy seizures are usually non related to eating and they can occur at anytime. But it may be just a coincidence. It seems not to be related to a cardiac arrhythmia, because the pacemaker would have changed this situation. Have you measured his blood pressure during these episodes? How long does he stay unconscious during these episodes? I recommend to closely monitor his blood pressure different times during the day, before and after the meals. A neurological consult coupled with a brain EEG to examine the brain function and rule in/out possible seizures would be necessary. Hope to have been helpful! Best wishes, Dr. Aida