What happens when you confront your hallucinations? Do they vanish / go back to their true form (i.e. a tire that appeared to be a dead animal goes back to being a tire)? Do the hallucinations remain even when confronted? Do you ever see them do anything? Are there any specific triggers you have pinpointed, such as stress or sleep-deprivation? The more info you can give a pdoc, the better they can pinpoint a possible cause and try to be of help (or refer you to a therapist if more appropriate, such as in the case of flashbacks).