Welcome to HCM!
This is Dr.Suleman Resident Cardiologist in Cardiac Rehablitation Center.Aspirin
drug is not a cure of Atrial Flutter
neither is exercise. Doctor precribed you Aspirin just to make thinner your blood thinner so that if you have Atrial Flutter attack again then no blood clot is form inside you heart. for you information there is a high risk of blood clot formation during atrial flutter. Lightheadedness
is one of many symptoms of Atrial Flutter. In our center many pateint complain this during atrial flutter or fibrillation
attack. this occurs due to very high heart rate
and your body and brain does not get enough blood. So i suggest you to go and visit an cardiologist and get Holter Monitoring. This device record your heart ECG for the whole day while you do your normal activities. Atrial Flutter is a transient condition and usually missed when you visit a doctor. but it is very treatable disease.
I suggest you must exclude it by visiting your physician and telling him to prescribe you holter Monitor.