I am looking for an endocrinologist who is not only prescribing levothyroxine as I cannot tolerate this. I have palpitations, my heart rate goes up to 180 heartbeats a minute and I feel ill and cannot sleep. I have been taking Nutri Thyroid but that does not seem to be the answer, as I now have high blood pressure. Can anyone help? I live in Croydon. My GP just says: keep looking on the internet.