57 years old healthy white male. Exercise 6 or 7 times per week, ...

57 years old healthy white male. Exercise 6 or 7 times per week, excellent diet, lots of neutricuticals. I gt occasional (once per month) bouts of lone atrial fib, requiring 2 to 3 doses of rythmol to regain sinus rythmn. I use metoprolol when I sense an impending atrial arythmn, usually once or twice a week. My only side effect is an inability to exercise strenuously while on the drug - just can't obtain a high enough heart rate. I am attempting to electrically reprogram my sympathetic nervous system. I am using rythmol and metoprolol proactively before an attack, soon as I feel one coming on. I have extended the intervals between episodes to about 5 weeks with this method. I would appreciate input from anyone with similar symptoms. Bruce