Demonic_angel
Wait. He lived through the pain by himself so that he could comfort his sister. Yet left her alone without any explanation or support other than his assistant when he died..?
Just explain that you experienced another life while you were in the coma. They already know that there are many mortal world's. While it might be unusual it's not like he has lost his memories. And without getting into the nature vs nurture debate, your emotions and personality are mostly influenced by your experiences.