These episodes come randomly, not having to do with your activeness or stress level, I used to have them
in the middle of math class. My doctor put me on a
heart monitor for a month, instead of the usual 24 hour ones. After they got the recordings, I was diagnosed with SVT. My doctor, like you, likes to avoid medicine if he can. But without medicine or surgery, the epidsodes will continue. I did not take medicine, I simply decided to have a SVT heart ablation surgery.