I am 39 years old 5'9 230 lbs.I have mild hypertension. I am on 10 mg of lisinopril daily. I have a really high heart rate about 75 % of the time. In fact, I called my cardiologist a couple of weeks ago. They sent me to the ER. Doctors there said that the rhythm was fine, so not to worry. I just don't feel like that is okay. Sometimes I sit here and it feels like my heart is pounding through my chest. It is between 110 and 120 most of the time. the night I went to the ER it was 135. Does anyone have any experience or advice? About 1.5 yers ago, I had a complete cardiac work up including a heart cath. All came back okay. I have palpitations fairly often. They came back as being "nothing to worry about" as well.