Sky - Can you post what you are referring to regarding DocJohn not believing that DID exists? This is what I just found on his FAQ of Life document:
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WHAT DO YOU THINK ABOUT MULTIPLE PERSONALITY DISORDER (MPD or DID)?
I seem to see a lot of people online who suffer from (or believe they suffer from) this relatively rare disorder, multiple personality disorder (MPD), now known as dissociative identity disorder (DID). First, MPD/DID is a rare disorder in the general population, as noted. However, many people use the online world to connect with others who also suffer from relatively rare medical or mental health conditions, so the fact that I have come across many people suffering from this problem online is not so significant in and of itself.
The research confirms this is a real disorder. Whether it is being diagnosed more often because clinicians are now more aware of it than ever before, or because people are more comfortable seeking treatment for it remains unknown.

Treatment of this problem is rarely simplistic. Many therapists' goal in treatment is to re-integrate all the personalities into the singular person which exists before them. For many people, this is an attainable goal with a lot of hard work in therapy and a determination and desire to change.

For others, this is not a realistic goal because they have become dependent on and can't imagine life without the other personalities. For these people, management of the existing personalities may be the purpose of treatment. Learning to cope with the blackouts and loss of memory may be helpful, as well as the possibility of integrating lesser personalities into others so a person is left with only a few main personalities over time.

There is no medication used to treat this disorder specifically, although medication may be prescribed to help certain anxiety or depressive symptoms.
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In saying " (or believe they suffer from)" to me simply means they have not been diagnosed by a professional (and the word "believe" is neither bold nor capitalized). For instance I may believe I have Generalized Anxiety Disorder, but until seen by a professional diagnostician, the label doesn't officially apply. I think the rest of his write up clearly states that DID does exist. Of course, there is a LOT of info on this site, and I only found this one article and stopped looking. So if I missed the article you are referring to, let me know. Thank you.

Emmy