I'm wondering if you mixed up terns? I know of non-sustained ventricular tachycardia which is NSVT. I've never heard of Non-sustained Supra Ventricular Tachycardia though. These terms can get confusing but they are very different.
NSVT in a structurally normal heart is usually labeled benign.
Like Jerry says follow your doc's orders.
Few here, I think, would recommend against your existing medical advice. Your doctors have the best data and knowledge/experience to advise you.
I follow my doctor's recommendations. I am one year older than you, so I do not stand a a proof of living into 80 years, but I can say I have suffered from atrial fibrillation and other heart problems for about 15 years and following my medical advice has helped sustain my life that long.
Good luck,