hello and welcome to healthcare magic.
your scenario with strange heart beats and light headedness suggest that the abnormal cardiac rhythm you have is of clinical significance .
it can be associated with heart valve diseases and as an isolated mechanism . it can be associated with coronary artery
disease . it is important and urgent to check your self by a cardiologist who will workup by doing HOLTERS MONITORING(continuous 24 hrs ECG ) an ECHOCARDIOGRAPHY
and physical examination and detailed history . wish you good luck