Ectopic Atrial tachycardia. 140 150 bpm!

I was diagnosed with Ectopic Atrial tachycardia 5 years ago with holter test showing ( Avg h.r.112, Min h.r. 63 & Max h.r.167) . And doctor suggested me to take METOCARD XL 25. But I was confused whether to start the medicine or not. I asked several general physicians. They suggested not to start these medicines because once i start it, I have to take it life long. Moreover my Echocardiogram report was normal. Showing grade 1 MVP . I also have anxiety problems and IBS. I am very much confused whether to start the medicine or not.?😢 I have symptoms like: 1. Fast heartbeat most of the time around 110 bpm 2. Urge of taking deep breaths 3. During normal walking and exercise it goes upto 140 150 bpm