I am 62 years old I have ridden since the age of 3. I raced from early 20's till age 48. I rode tandem with the wife till age 50. I then got off the bike for till recently. I gained tons of weight and felt terrible. I began to have problems with A Fib last year. Christmas I started on Fitness Pal and began to ride again. I've lost 65 lbs so far feel better. I had a bad experience on the bike in July. No A Fib since December 2012. I was on a weekly group ride and started feeling badly. I stop for a break and passed out. Went to the er and it was bad afib again. I was set for cardio version and I went back to normal rythmn on my own. I then began to go in and out and finally I stayed till I had an ablasion procedure, which worked for 24 hours and back to a fib. I had cardio version four days after and was not able to convert. I waited for four weeks and had another cardio version and worked for three days and back to a fib. I had another cardio version last friday and I have felt great till yesterday and on my daily ride i went back into A Fib. I still ride but the heart rate is high and stamina minimal. I know there has got to be a way to fix this or some kind of help. I love riding and I don't want to ever stop again.