You should not stop an ad suddenly and your therapist should know this. Allowing you to not have refills enough to at least taper is putting you through unnecessary suffering and at risk. Stress to them that you need the refill. If you don't get a response, going to a hospital or immediate care center might be your best bet. If it comes to that, you might want to consider reporting your therapist because that is not how a professional should treat a patient.