There are more dangerous arrhythmias than what you have been diagnosed with, however, it is not a good idea to have a heart rate the fast for any length of time.
As to the ablation, I have read both good and bad things about it, some say it helped immensely, others say it did nothing, same as the drugs, I think it all depends on the individual.
Thanks for your response.
I have left aflutter. They say that right aflutter usually has better odds being treated by ablation and is a simplier procedure. It may be helpful to find out which type of aflutter you have.