In order for a dissociative identity disorder to be diagnosed various symptoms/criteria will need to be met-
Example: the presence of two or more distinct identities or personality states, at least two of these recurrently taking control of the person's behavior, inability to recall important information, the disturbance is not due to direct physiological effects or as a result of substances.
Depersonalization as a disorder in itself also has to meet specific criteria/symptoms. Sometimes individuals may experience depersonalization when under a lot of physiological and psychological stress (but that in itself will not lead to the existence or diagnosis of Depersonalization Disorder ) Speaking in a child's voice by itself will not constitute a DID diagnosis. If you believe that you have a personality disorder such as DID then only a specialist in this area is the one that can assist w/ proper counseling and treatment. If you are seeking a specific diagnosis you may want to try and get an evaluation by a psychologist face to face for an extensive assessment.
The dilation of the pupils is something you may want to mention to your doctor (it could be a side effect of medication, neurological or have any other organic cause hence, this will be something a physician will need to look into) Dilated pupils is not a symptom of DID or other personality disorders, depression or anxiety.
Hopefully your counselor is utilizing cognitive behavioral therapy techniques (quite helpful with anxiety and obsessions/compulsions)
If you are open to different anti anxiety medications you could mention this to your physician. Hypnotherapy is also helpful in addition to the other options.