Hiya Hilery. What you experiencing it's probably premature atrial or ventricular contractions. (PAC'S or PVC'S) They are benign and they are more scary than harmful. Many things can cause these including coffee cold remedies, alcohol, illegal drugs, prescription drugs like beta blockers and other antiarrhythmia drugs [and its weird but antiarrhythmic drugs can make a heart arrhythmia even worse], anxiety and panic attacks. On the panic attacks it is like the chicken-egg thing. It is not clear if panic attacks cause the ectopies or the ectopies cause the panic. ( ectopy its a medical term from the Greek word which means out of place. Out of place or the normal heart beat).
Tell your doctor to refer you to a cardiologist and have a holter monitor for 24-48 hours to see what its going to record. Avoid the stess test because its possible, though rare, to cause you a heart attack on the spot especially if an underline heart condition exists.
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