Boyd JD
Am J Clin Hypn 1997 Oct;40(2):97-110
PMID: 9385721
Abstract
Numerous anecdotal reports and textbooks from distinguished mental health practitioners have accorded to clinical hypnosis a prominent role in the successful psychotherapeutic treatment of Dissociative Identity Disorder (DID). This ideographic inquiry of one such treatment offers empirical support for the instrumental effects of clinical hypnosis with a highly hypnotizable patient who alleged intermittent sexual abuse during the 2-5 age range. Multiple pre- and post-intervention measures, plus treatment trajectory monitoring and explication, demonstrate how hypnosis methodology contributed to a rapid recovery from DID. Future research is called for to further elucidate the therapeutic benefits of clinical hypnosis for DID patients having different levels of hypnotizability and treatment responsiveness.
This is from 1997 - before the publication of the Dissociative Identity Disorder treatment guidelines. Hypnosis should not be used for any memory work, but some auto-hypnotic techniques can be taught for self-soothing, for example visualizing a "safe space". Hypnosis is not considered a primary treatment method, although historically some of the first practitioners to try to treat dissociative identity disorder had some success, Pierre Janet and Signmund Freud studied the effects of hypnosis.
The treatment guidelines for dissociative identity disorder can be found on http://isst-d.org and are summarized here http://www.dissociative-identity-disorder.net/wiki/Treatment