From a Psychiatric point of view Risperdal should help your disassociative symptoms. While DID was once considered rare, it is becoming slightly more common.

Disassociation is not consider a disorder by itself. It is more of a symptom.

Obviously there are some really personal questions that need to be asked to see if DID is your root diagnosis. Questions that aren't appropriate to ask here.

Your doctors are taking an epidemiological route in thinking that you have a more common cause to your disassociation--psychosis. The word psychosis sometimes invokes ideas of insanity. Psychosis can be severe or it can be subtle.

Give the Risperdal some time to work. If you are not improving hopefully your pdoc will explore some more options.

I don't feel he/she is isolating you. This is a standard practice in medicine to assume that the patient has the common vs the uncommon. Once he/she has ruled out the common he will look into the uncommon, like DID.