I have been on 25mg twice a day for 2 1/2 years after having a stent. When I am not active my pulse goes down to 46 to 48 and my headache worsens. The Drs. don't seem to be concerned and the Cardiologist says the headaches are not from my Heart. Could I do better with less dosage? I have had all tests to see what is causing the headaches to no solution.