You might want to talk with your therapist and family physician about this.

from what I know from many professionals in the field of Dissociative Identity Disorder the losing time and having alters does not suddenly appear as an adult. (By the way you can find a big part of my research information in the resource thread that is pinned to the subject index of the dissociative disorders message board)

DID begins in childhood and carries over into adult hood so all the symptoms of having DID - time loss, hearing voices and finding evidence (writing drawing new things appearing losing items and so on) begin and stay with the person who has DID and the symptoms have been going on since the first alter was created in childhood. Which is also one of the criteria that professionals use in differentiating between DID and other mental health disorders.

for example -

Schizophrenia on the other hand the person percieves hearing voices and alters and so on at any point childhood or adulthood.

Also sometimes people with borderline personality Disorder, bipolar disorder depression and many other mental health problems can cause memory loss, halucinations, percieving mood swings as different parts and so on. With these the problems come on suddenly too.

Medical problems can also cause the symptoms that you are discribing for example a person with a tumor sometimes experience memory problems with includes not remembering what you did at such and such a time. mood swings sometimes percieved as different parts. Sleep depravation can cause these same type of symptoms as can certain chemical imballances, and with medical problems the symptoms suddenly appear.

Since what you are experiencing has not been always happening to you my suggestion is schedule and appointment with your family physician and therapist.

You physician can schedule or refer you for testing of cat scans, physicals, blood tests, and so on to help rule out or in medical problems that may be affecting you.

Your therapist can refer you to a psychologist and or psychiatrist for a diagnostic test called Comprehensive Psychological Evaluation with suplimental testing for DID so that you will know for sure what is going on with you and which mental disorder you have of all the ones that have these type of symptoms that you are discribing.

OOPS just noticed you have posted today that you saw your therapist. Glad to know she now knows what is going on with you. Hang in there.