There are a variety of reasons for the symptoms
you are experiencing including premature atrial
or ventricular contractions
or an SVT (supraventricular tachycardia) which includes a number of different types (atrial flutter, atiral fibrillation, AVNRT, atrial tachycardia, junctional tachycardia). The first step is to identify what is going on which is often done initially by a standard 12-lead EKG and possibly a holter monitor.