I battle this too. Internal voices usually stemming from an Idea Of Reference that is terrorizing me. I couldn't tell the difference before and thought an outside source was implanting the narratives in my mind. Since my doctor told me they are ideas of reference, I'm able to tell myself "that's just an idea of reference" and that helps a bit. Doesn't stop it from happening but keeps me from thinking something supernatural is afoot. I hope you find something which helps soon. (((Hugs)))