It seems to me you do not need the Metoprolol (I take 100+ mg a day for rate control caused by my full-time AFib). Keep in mind I am not giving medical advice, i.e., I am not a medical doctor and I have only the information provided in your brief post. That said, if the Metoprolol is specifically to help heal/treat you heart attack, then by all means keep it up and I don't think a resting HR of 49 is problematic, given your history, but I don't know what it was before the heart attack. Aspirin is a good idea given the bouts of AFib, which increase the chance of clot formation. You have another clot factor, age. So I am a bit surprised you doctor hasn't put you on an anticoagulant (warfarin/coumadin)...but great if you can avoid that medication as it adds is own complications and risks.