My male partner, 62 years of age has blocked carotid arteries as a result of radiation therapy for throat cancer 15 years ago. On Friday, after a day of sitting, he was dizzy and feeling disoriented for about an hour at 4:00 pm. Everything seemed to return to normal after an hour or so. Today, Sunday, after Brunch, he had some memory loss, again last for about an hour. Is this something we need to worry about?