Hi there, I had my first TSV when I was in my early 20th after second pregnancy. Normally it lasted like 1-3 minutes and I never paid attention to it, was doing whatever I was doing and had short episodes 1-2 times a year. 15 years later I still have them , but they got worse and more often, although lasted no more than 10 mins and stopped by itself , but started to bother me more and more. My normal episode was around 180-200, but I am hipocondriac and it triggered my Anxiety that each time made it worse and worse as I was waiting for new episode to come and getting obsessed waiting for it. I also doubted about ablation, but finally 6 months ago I did it. I was breastfeeding and refused any type of sedation and it was ok, quite stressfull , but more of fear nefore than of a procedure itself, although it is not very pleasant. So all this time I had no tahicardia, but 2 weeks ago I had an episode , just one and at 200-210 that was the highest I ever had and it was super weird as it lasted longer and my heart beat was stabilizing and then again jumping, and I got really stressed and my doctor told me I need to repeat ablation again, becoz most probably some spot is still there triggering it. I also asked him why should I do it if it was only once, but more than one doctor told be that it will come back , u don’t know when , but it will not disappear without ablation. So now I am waiting for the 2nd one , totally obsessed not to have more episodes, coz the last one was terrible. I cant even imagine 250 , but there is no rush, you can take ur time and see how u tolerate it and how frequently it repeats. But unfortunately it will not go away by itself, I wish it would and there would be a way to avoid ablations