Had a Heart Attack in January. Put a stent in the rear artery that was 95% clogged. I am not taking an aspirin daily along with Clopidogrel (protect stent), Pantoprazole (Acid reflux), Carvedilol twice daily (lower heart rate/BLO, Simvastatin (Cholesterol). Yesterday my Dr. told me to stop the Carvedilol and she would send me a lower dose. I have not taken one since yesterday morning but am having trouble today with the liteheadedness. They are sending me a cup but it won t be here for a couple days. Can still problem, if it persists, cause more harm to my heart?