"They can be plagued by guilt and disbelief, as well as feeling isolated, lonely and out of their depth."
Garnham has now established a new club for the super rich where they can talk, share problems and even go on holiday together.
Her Virtual Family Office Club already has 800 members with a total wealth of 100 billion ($203 billion). At a recent evening party held at her home, 30 people attended, with a total net worth estimated at 12.8 billion.
Garnham also believes the super rich have been too readily made scapegoats for the financial crash.
"The top 1 per cent of wealthy individuals in Britain pay 30 per cent of the total income tax," she writes in her book.
"It is the rich who drove the British economy out of recession and winched it out of the deepest recession in 100 years."
Garnham said: "They are real people. It is difficult for the rich to get a handle on who they can trust."