What could be causing my occasional palpitations, breathlessness, and irregular heart rate? the last episode lasted most of last week .

Atrial fibrillation: Without doing an actual exam and/or ekg, it is difficult to tell what you have. However, your symptom pattern suggests possible cardiac arrhythmia called atrial fibrillation, the most common type of in the adults/elderly. Chronic hypertension is a common cause of this, risk of blood clot/strokes= concenring, and it is more common as one gets older. Consult doc for eval and treatment. Good luck.

Atrial fibrillation : Your symptoms required a full evaluation. You could be describing intermittent atrial fibrillation which requires treatment. At age 61, however, a lot of things can happen to your heart . Your symptoms are somewhat nonspecific and could be a number of things.