I have put this small list of symptoms that someone with MPD/DID would have. Use it as a reference, do not analyze yourself or someone you may know. I'm not a professional! If you think you or someone you know may have MPD/DID please see a professional.
Hearing voices within not audible
Amnesia - not remembering where you were or how you got to a certain place. Or buying something you don't remember buying.
Noticing that things are missing or new things that you can't account for. Like new clothe, new shoes and so on.
Others may tell you of events that you can't remember
Feeling like another person exist inside that is unlike you.
Referring to yourself as "We" "Us" "Her" or "She"
Lost of energy
Suicidal Behavior or attempts
Feeling surreal and disconnected from reality
Different talents, skills and interest more the usual
Talk of missing days, weeks and even years
Injuring oneself in anyway that is hurtful to the body or person and not being aware of it
Switching emotions of pain to laughter like it was nothing
Crying all of a sudden and instantly cutting it off like nothing has happen
Having many forms of sex problems
Being diagnosed previously with one or more of the following: bipolar, borderline personality disorder, severe depression or schizophrenia
Feelings of shame, guilt
Feeling like your a burden to others
Not feeling connected to your surrounding (not like deja vu)
Don't like asking for any kind of help
Shutting down or finding yourself in a fetal position
Unaware of how you found yourself in a different place
Described by others as two or more personality
Not recognizing a friend or family member
Having different life styles
Outburst of anger for no apparent reason
Changes in appearance and body language
Talking to oneself as though you're correcting someone
And the list could go on.
These signs or symptoms may vary from multiple to multiple. Not every person is the same. If you need help contact a professional who is open minded and not set in the old ways of psychology. There is help for those who suffer with MPD/DTD. Stand strong and stay safe.