I have been battling with beta blockers for months. I had a Dr. who wanted me to stop the propranolol I was on so I could have some allergy tests. I got the OK from the doctor and was told to just skip the meds for 4 days. Within 24 hrs my heart was racing out of control. Dr. told me to take them again. I tried 2 more times to stop. I was referred to a cardiologist to help me taper off, but instead she put me on a 2nd medication and kept the beta blocker. I gave up and cancelled the allergy tests. I never knew the side effects if this stuff could be so bad. I am now on two meds and have to monitor my heart rate every day!!!