Your heart rate will be a lot higher than 70-85 bpm if you are having an AF episode. It is could just be anxiety. Prednisone prescription is for something other than AF. Taking warfarin will pretty much eliminate your risk of a stroke from AF and your AF is still paroxysmal and non-life threatening during an episode. Try to find an activity that you find relaxing and stop worrying about the AF. If your AF becomes symptomatic, then ablation is an option.