You have very disruptive symptoms but it is good that you are aware of them. Many individuals experiencing delusions and hallucinations aren’t aware that symptoms are present. In many respects, it is hopeful news. Being aware of your symptoms means that you can do something about them.
You attempted to discuss your psychiatric symptoms with the doctor who is treating your diabetes. The physician and nurse urged you to go to a hospital. They probably recognized the need to be seen by a psychiatrist or other mental health professional. I would agree with their advice. You should go to a hospital.
At the hospital, report your symptoms. Tell them about the voices. Report exactly what the voices are telling you to do. Report your belief that individuals are conspiring to harm you and that you have a desire to self-mutilate. The more information you can provide about your symptoms the more they can help you.
The hospital can provide a psychiatric evaluation and if necessary, hospitalization and treatment. Please do not hesitate to go to the hospital. Given the seriousness of your symptoms, it is imperative that you receive help as soon as possible. Call 911 or the local mental health crisis team if you feel overwhelmed or if you are unsure how to proceed. I wish you the best. Please take care.