It is important for you to discuss your symptoms further with your primary care physician
. In general, a normal heart rate for most adults is 60-100. The rate increases in situations such as exercise, when the heart needs to provide more oxygen-rich blood to your body's organs. At other times, such as during sleep, your heart rate can be slower. However, a slow heart rate accompanied by difficulty breathing could be indicative of an abnormality of your heart's intrinsic conduction system. In such situations, the normal electrical signals that cause your heart to beat do not progress normally through the heart. This can be life threatening, which is why you should see your doctor.
Your palpitations may also be caused by an arrhythmia. Some common examples include atrial fibrillation, atrial flutter, atrioventricular reciprocating tachycardia, AV nodal reentrant tachycardia, or atrial tachycardia. You may also be sensing premature, isolated beats that originate in your heart but outside the typical electrical conduction system. These are common and are typically benign. However, it is not normal for you to be experiencing shortness of breath, which is why you should discuss this with your physician. A typical evaluation consists of a thorough history, physical exam, and EKG