It may also be causing atrial fibrillation later, so if there is a cause (like
high blood pressure, overweight, sleep apnea, pulmonary diseases, etc), you must get it treated by your doctor.
Is your blood pressure normal when you don't have the tachycardia?
As far as I know, treatment is: 1) To treat the underlying condition, if it exists, and 2) if this will not stop the tachycardia from happening, the spot causing the tachycardia may be ablated.