DID (Dissociative Identity Disorder) is my favorite mental illness, because it like a bunch of people sharing the same body. It has several causes. This disease has a long history. DID have been used by Satanists and the CIA 4 various reasons. I will list sum of the people with DID. There is a cure for DID.
Someone with DID have multiple personalities called alters (alternative personalities). Each personality has its own identity. Each altar has it own memories. The memories of one altar is separated by another. It called an amnesia blocks. Altars may have different genders, political affiliations, sexual preferences, morality, ages, etc.
Great trauma caused to a baby can cause them to dissociate. If this happens over a long period of time they will have DID. One of the altars will deal with the trauma while the others won't. DID is a defense mechanism, it protects the core personality. Most cases of DID come from prolong emotional, physical, and/or sexual abuse to someone between 0-2 years of age.
War could cause DID. This is because sum soldiers experience experience great trauma. A lot of them get PTSD. Civilians could get DID as well, especially children.
It may have existed since prehistoric times and demonic possessions may have been a manifestation of it. The first known person with DID was a German woman in 1791. Her altar was French and she had amnesia blocks. Sometimes DID is misdiagnosed. Some people with schizophrenia/bipolar same like they have DID.
The CIA created a mind control research program called MK Ultra. They used LSD an other means to control people minds. A part of MK Ultra was the Monarch Project. That project was about causing someone to develop DID and programming the different altars for different tasks. Victims were used 4 spying, assassinations, etc.
Roseanne Barr has 7 personalities. She calls 2 of them Somebody and Nobody.
Britney Spears has @ least 4 personalities. They are as follows: weepy girl, British girl, incoherent girl and diva.
Nicki Minaj has several personalities, one of them is named after a famous pedophile.
Lady Gaga may have DID.
Mel Gibson may have it as well.
Truddi Chase has 92 personalities. She was interviewed by Oprah.
Integration
The way someone gets rid of DID is by combining all the altars into the core personality. The altars may be kicking and screaming but that is what needs to be done. Some patients with DID do art therapy. Each altar has their own style of art. Therapists help the altars communicate with each other more effectively. They also discourage patients from following destructive altars.
DID is a reaction to extreme trauma. The causes of it is terrible, but it's still favorite mental illness. That because it is like a bunch of people sharing one body. But it's just one person coping with trauma. It has a long history. DID been around 4 centuries or millennia. The CIA gave DID to people for nefarious purposes. A lot of famous people go it. You can even see it in music videos!
https://en.wikipedia.org/wiki/Dissociation_(psychology)
https://www.healthyplace.com/abuse/dissociative-identity-disorder/dissociative-identity-disorder-did-statistics-and-facts
https://sunrisehouse.com/multiple-personality-disorder/root-causes/
https://www.healthyplace.com/abuse/dissociative-identity-disorder/the-amazing-history-of-dissociative-identity-disorder-did
https://www.trinfinity8.com/mkultra-what-i-learned-about-mind-control-from-clients/
https://www.ranker.com/list/celebrities-with-multiple-personalities/celebrity-lists
http://www.isst-d.org/downloads/guidelines_revised2011.pdf