My husband, 68 yo, recently had an episode of memory loss of about 6-7 hours. During this time he was functioning as usual. Such as dressing, walking, talking, but had no idea where he was or how he got there. Answered questions by answering "I don't know, or I don't remember". CT was pretty well normal, MRI showed "minimal periventicular white matter eschemia" with periods appearing blocked" has since felt pretty well. Bp is usually normal, no diabetes, but does have high cholesterol, waiting for neurologist appt. Any ideas?