DID is an extreme form of dissociation, and can be discribed as disconnection, dysfunctional dissociation. It is just one way people insulate themselves from pain, and actually serves as a very adaptive and life affirming defence at one point in time.
DID dissociation has what is discribed as Alters ( alternate personalities ). Dissociated parts of the self that represent memories, emotions and ways of relating. They are able to function independently from each other and can be refered to as "Parts ".
My "Parts " don't like being refered to as Alters, they prefer family or kids. I often call them my jig saw family.. I have come to know them, piece by piece. Though they don't fit together, at least it's in part, an acknowledgment that I do exist, even though memories don't.
I believe I have what is refered to as Polyfragmented, over 100 personalities. I stopped counting as numbers were not important, history was. This is caused by ritual or prolonged abuse.
Different parts can have different illnesses. I can hear a few sniggers and eye brows raised here, but it's actually documented, not a figment of my imagination. This is why finding medications that help can be so difficult. Not all my personalities are depressed for instance, so if this personality takes an anti depressant, there can be problems.
I passed this by my dr a few months back as we were having all sorts of trouble with meds not helping for all sorts of different problems. Though the conversation wasn't a complete success, ( I didn't expect it to be ) it wasn't a complete disaster either. Though the silence was deafening, she didn't call am ambulance either. As a member pointed out to me here on the forum, it might make it easier for the next person who presents with the same issues. Slowly medical professionals will see the light if we find small amounts of courage to speak up. I hope so anyway.