I would definitely suggest telling your therapist in a more direct way about the voice you are hearing. I'm just a bit concerned for you that she only said, "don't worry about it." Is it possible she misunderstood what you told her? I think it's just really important that you get the proper care because it sounds like you are going through something really scary and you deserve to have someone validate this and help you to alleviate your pain. Are you currently seeing a psychiatrist in conjunction with your therapist? Please take care of yourself and let me know what happens.