Cofty, you may be right. Viv's problem might not be psycological. It might be physical, lack of oxygen.
Demonstration: Then it might be a case of tersiary siphilis. The spirochaete T. pallidum, if left untreated, attacks the brain. This disease was quite rampant during the 17th and 18th century. The British called it the French disease and the French called it the British disease. That's what I meant by discussing an organism (related to Microbiology of course). Off the cuff I can tell a lot of stories, without having the chance to Google it.
Perhaps she's got a pubic itch distracting her. Pubic lice or Pthiris pubis looks like a little monkey under the microscope. Its palm tree is the pubic hair. It climbs up the hair and stays there. Then comes down when hungry and drink blood. This bite causes an irritating rash. The lice itself looks like a little scab on the skin. When you see it on a person, you start itching all over. It's psychosomatic, all in the brain. And no, it doesn't help blaming dogs or horses. It is a human problem, adapted to survive on human pubic hair alone. Course of action: An ointment, razor and the removal of all pubic hair.