Possible Clues:

• Delusions of grandeur
• Grandiose delusions
• Delusion of power
• Condition whose first two letters are oddly appropriate
• Among email letters being exchanged, a chronic lack of modesty
• Delusion about one's own power
• Swelling of the head causing such mental disturbance?
• Crazed condition in which one feels great
• Folie de grandeur
• Illness that doesn't make one feel great normally