I’ve never had amnesia.
The closest I have ever come to memory loss was the few hours following the removal of my wisdom teeth. While I wish to save the actual wisdom-teeth anecdote for later, suffice it to say that I do not remember anything that happened once the anesthesia kicked in. My parents tell me that I blubbered like a buffoon, though. Which, in all honesty, I could see myself doing.
Unfortunately for Utawarerumono: Itsuwari no Kamen, it ends up as a forgetful experience, too.