He is tuning into prior life circumstances in those ancient days and this is stirring up anxiety within because those times were quite trying. He was a gifted sage, and as a valued advisor was entombed with a pharaoh to be ready to serve him in the afterlife, and he suffered a terrifying and slow death as a consequence. It is that ghastly experience that rumbles when he is reminded of Egyptian lore. This could be addressed with HMR in his case or subconscious channeling. Additional Protocol work would also create the opportunity to dampen the symptoms.