Personality Disorders Support Group
Personality disorders form a class of mental disorders that are characterized by long-lasting rigid patterns of thought and behaviour. Personality disorders are seen by the American Psychiatric Association as an enduring pattern of inner experience and behavior that deviates markedly from the expectations of the culture of the individual who exhibits it.

it sounds like stress? unless you have dissositive identity disorder then see your dr.
I was given the same test and I passed but I still deal with forgetting stuff and I will go to do something and forget and so its hard that a minor test like they give solves it. I am on meds so that might be what is causisng it for me. If your on some meds it can cause you to do this.But talk to your doctor again because there is a reason its happening. good luck. let us know the update.