Dissociative identity disorder (DID) is a controversial diagnosis. The controversy has existed for decades and will not be resolved in the near future. Though it remains a diagnosis in the Diagnostic and Statistical Manual For Mental Health Disorders (DSM), some clinicians deny its existence. DID may be the most poorly understood mental health disorder. Part of the reason may be that researchers are reluctant to study DID. It may also be that the government is often unwilling to fund DID research efforts. The end result is a lack of clarity and consensus about DID among mental health professionals.
You stated that you have a legitimate reason to believe that you have DID but did not provide the reason in your letter. Perhaps you are referring to the fact that a psychiatrist believes it’s a possibility. Your symptoms include depression, inability to recall past memories, inability to concentrate, hearing voices, engaging in self-injury, and being angry. Most are not the symptoms associated with DID per se. They may be symptoms of depression or a combination of other mental health disorders but they are not characteristic any one specific type of mental illness.
The symptoms you have are concerning. They are disrupting your life and thus require treatment. It would be advantageous to see both a psychotherapist and a psychiatrist. A psychotherapist could help you to develop the skills necessary to appropriately cope with your symptoms. Medication could decrease the frequency and the intensity of your symptoms.
The good news is that you have already begun treatment with a psychiatrist. Continue with that treatment and consider the addition of psychotherapy. Combining both psychotherapy and medication could greatly improve the quality of your life. Please take care.