I used to have external visual/auditory pseudo hallucinations. My doc said if I know they aren't real then its ok.

But I have lots of voices in my head, some are friends and some are enemies but over time I've learned who they are. Each voice seems to be a different part of my personality which seem to constantly be at war. For example, I'm an alcoholic, but sober, and so that alcoholic part of me talks in a low male voice from over my right shoulder (but still in my head) There's a part of me that acts up when i get "crazy" highly emotional and she usually is telling me to self destruct. She speaks from right above my left forehead (still in my head though)
I've just identified who they are and learn to live with them. When the negative voices surface they are hard to tune out but I can try to call on the voices in there which I know will help me. The positive ones seem really hard to access though, sometimes all they can say is get to the hospital you need help.

I'm just plain bipolar with tendencies to dissociate. Thanks likewater! This totally explains why different parts of me have their own voices!