I've had hypertension and tachycardia problems for years now and have also been on a beta blocker for many years. The past week or so though, my normally high blood pressure has been low to normal and my heart rate has been exceptionally low. I'm currently taking half of my very low dose of propranolol (beta blocker). So when active my heart rate which is usually 85-110 active, has been 60-70 max. And my resting heart rate which is usually 60-75 has been. 40-50. I'm not athletic, I don't exercise, and its normally high. Should I be worried? Is this like heart failure or something?