In most mental disorders there is no one qualifying factor.

I can't look at your MRI and say because you have this abnormality you have this disorder.

DID, Bipolar Disorder, Borderline, Schizophrenia, PTSD, Anxiety Disorder......they all have symptoms that match what you described.

I know you like to have a category to put yourself into but consider the fact that no one disorder can account for every symptom. And we can't even begin to qualify feelings.

Your therapist is required to assign a diagnosis based on what symptoms present to him/her. The DSM is only a tiny tiny portion of what it is like to have that mental disorder.

Many people receive different diagnosis throughout their lives. What begins as ADHD in childhood may become Bipolar in your twenties, DID in your thirties.

The important thing is that your therapist has the skills to treat you and bring you to state that you can use your own body's defense mechanisms in a way that will leave you at peace at the end of the day, instead of chaos.