@Cafe41 - I just can’t believe that no one even reported this man missing. I heard of a case about a lady that also had retrograde memory loss and she had to learn how to do everything all over again.
She says that the last thing that she remembered was that someone gave her a pill that she later took and it put her in a coma. This coma did so much damage to her brain that she had to take speech and occupational therapy in order to learn how to talk and even write her name.
She said that she has no long term memory and her short term memory is almost nonexistent. In fact, she forgets everything that someone has said to her moments after they leave. She also has no childhood memories so she cannot even talk about how she grew up.
She is seeing a therapist in order to deal with her situation and is coping by videotaping everything so that she can replay the tapes and hope to improve some of her memory.
She was also obsessed with taking pictures because she knows that she will not even remember that she saw something or went to an event. I know that they use picture therapy for patients with dementia in hopes of having something trigger a past memory, so maybe this will work as an effective retrograde amnesia treatment for these patients as well.