Borderline personality disorder and schizophrenia aren’t mutually exclusive and don’t even have the same symptoms. Is your doctor actually said he is changing it? Seems a bit strange. Are you on meds for your schizophrenia? Hallucinations is a serious symptoms and typically isn’t common for BPD diagnosis. I hope you address your hallucinations, I am surprised you only see pdoc annually. Could you call them and tell them you need earlier appointment and possibly med adjustment?