Hi lybrate-user,
The symptoms you describe can very well be due to SVT, or PSVT to be precise (Paroxysmal Supra-Ventricular Tachycardia). Electrophysiologist won't help much unless you have a diagnosis. Since your symptoms are not daily, its likely 2 day event monitor didn't catch the abnormal rhythm. The next best option here is to get a 15 day or 30 day event recorder. That has higher likelihood of catching the arrhythmia. These days, you also get devices like Kardia or Remote ECG which you can keep in your pocket and attach to yourself whenever you get palpitations.
Also get your thyroid checked if it isn't checked yet.
Take care.