I suffered from these for a few years before I moved to the US. Saw a couple of cardiologists and nephrologists and was told it's related to anxiety, sleep better, cut down on caffeine. It WASN'T!!! I had a real problem and I was only diagnosed when I moved to the US and got pregnant (and the arrhythmia became much worse and the exhaustion was debilitating, but I thought it was related to twin pregnancy)
I was finally diagnosed with RVOT when the anesthesiologist freaked out during my C-section because apparently I had an arrhythmia episode for 12s and he was afraid my heart would stop (I was feeling just fine cause I had gotten used to them!).
After my delivery he transferred me to ICU where I was monitored for 3 days and finally diagnosed. I was put on beta blockers but it didn't get better, so had an ablation, and it was like magic! I now find it so weird that I don't hear my heart beats! And I can exercise like a normal 40y old and not feel like I'm 90!
Like you, my heart was structurally normal, and RVOT is benign and won't "usually" kill you. But it is debilitating! And it is triggered by anxiety, caffeine, alcohol, hormones, lack of sleep... but how can you avoid all these?
It's no way to live. Don't accept that just because your heart is structurally normal and it's benign, that you have to live with it.