My experience with SVT's is quite different. I have an un-diagnosed autoimmune disease. I have been admitted to 5 different hospitals from Sept. 2017 through June 2018 including about 2 weeks in the Mayo hospital in Minnesota. SVT and fluid filled lungs were my first of many symptoms. I did not know why I was so exhausted and could hardly stand up or walk until going to the ER and being rushed in an exam room because my heart was racing. They tried the "vagus" maneuvers and had no luck. They used medication (too much) 60 mg because my husband said I flat lined and my whole body was shaking violently. But it worked. Throughout my illness which was total body inflammation finally going into total kidney shut down included many times of SVT but after this initial time they occurred only in the hospitals leading me to believe, in my situation, to be somewhat driven by anxiety. Cardiologist did say I needed ablation but had to recover to even consider it. The last time I was in the hospital, I kept having SVT after SVT with me losing count after 5 and the hospital staff panicking and bringing the crash cart in, hooking me up, etc. etc. I finally said to a specialty nurse that I wanted to take a Xanax and wait 30 minutes to see if I could stop it myself. He allowed it and it worked. Two times in a row, it worked. I have not had any SVT since which is about a year now but my body is recovering in other ways. I do not take Xanax regularly. But I do have anxiety and use it as needed. I do not have any heart issues that were found except fluid around my heart that was removed, inflammation again, and have recovered enough to have normal inflammation markers for the last almost year and my kidney's recovered in 4 months so that I was removed from dialysis.
Every doctor I have seen says I am a puzzle. I take Colchicine and a very low dose of Prednisone (2 mg at present) and pray that I can recover if my illness comes back. They say they can't give me anything else because they don't know what it is.
This story may not have helped you and after having 5 lengthy hospital stays, I have left much out. I just felt that my SVT story is different because I recovered without an ablation.
I wish you the best.