hey, heart rate in the 200's? YES, you need to do more. You already are doing the first step in vagaling.
You didn't mention what med's have been tried for therapy, so I can't guess what has been missed. (I'm a CCU nurse 5 years).
If anxiety attacks and electrolyte imbalances and pain have been ruled out....
May I suggest a second opinion, of a cardiologist not in the same group. Go to your CCU unit and ask for the charge nurse, tell her in confidence and ask if she could point you in the direction of a cardiologist she would have treat her with your symptoms.
You know the drill, they may not give a name"oh, they're all good". But you may luck out and get a vote of confidence... after all isn't the nurses the ones who know the doc's? You may have a conservative doc.....I am not suggesting the doc is a quack though.
Ablation, sorry my spelling
is horrendous, therapy is not guarenteed, and there are re-occurences if more than one re-entry pathway or abberant pathway is present and cannot be illicited during your study.
The cause of your illness has not been thououghly identified because it is reoccurring! Hating doctors and tests myself, I am sorry to advise that I think you need to seek a second and fresh opinion, especially if you have not exhausted the medical (pill) management first.
Wishing you health and happiness... keep us informed