Hello! Thank you for asking on HCM! I read your question carefully and understand your concern. I would like to explain that global transient amnesia is commonly related to emotional stress. Migraine attacks have been associated to this disorder, and some researchers suggest that it is a “migraine-like” phenomenon. Its recurrence goes up to 40% of cases and there is no limit of times for that. This is a benign condition and the persons regains the memory slowly after the episode. In contrast with this the memory loss after a head concussion (like in your case) is something different, where the brain has not been able to memorize some moments of the trauma, because a temporary dysfunction ( and you may never remember what happened, because the memories do not exist in your brain). But sometimes transient global amnesia attacks can not be distinguished by seizures. So I recommend you to consult with the neurologist and perform an EEG. If the EEG is normal, there is nothing to worry about. Hope to have been helpful! Greetings! Dr. Aida