I had voices from May 2003 until January 2007 and nothing since. From 11/2003 until 11/2004 I would get 100comments per minute from a group of voices I never named. They all said they were from ASIO.
In 11/2004 I did Transcranial Magnetic Stimulation (TMS) at Prince of Wales Hospital. That stopped the voices from talking about a past event and changed there focus to the present and reduced the rate to 20 per minute.
In 12/2006 I figured out pressure on my Larynx would stop them completely so I kept pressure on for 6 weeks and did some exercises suggested by a speech pathologist. The interesting thing is I could control what they said by counting in my head. Changing voices was like changing the tone. The speech pathologist suggested the counting in the head thing.
All I know about psychology is "never give a job to someone who thinks it can't be done."