Atrial Tacchycardia with multiple foci

DOES ANYONE HAVE A CLUE AS TO CAUSE?  Feb 1, 2011 I had an episode of 150 bpm for 4 hours. Since then I have had a wide range of accelerated heart rate episodes multiple times on most days (up to 200 bpm and ranging from a few minutes to an hour and a half long).  I have only used metropolol, (doses up to 150 mg/day), I was afraid of antiarrythmics resulting in more serious issues as currently my sinus rythym has been great. I have worn a 24 hr monitor twice and a 30 day monitor once so the variety of my events is well documented.  I had a cardiac ablation in October on 4 spots near each other on the right atrium. Although I had multiple foci my understanding is it is not considered MAT. The ablation appeared to have worked for 5 weeks, but then all symptoms resumed. My quality of life is near non-existent. I am waiting for the results of another echo.  My last score was 50 (low end of normal) and my electrophysiologist wants to ensure no new structural issues exist before considering another ablation. My electrophysiologist had me asleep for the 5 hr mapping/ablation last time and does not seem to think keeping me awake would increase effectiveness if we do it again, IS THERE A PROVED PROTOCOL?,NEWEST TECHNOLOGY?  BEST DR/HOSPITAL? ANY EFFECTIVE ALTERNATIVE MEDICINE?