Chad, wolfer is right about the sleep apnea connection. If your doctor hasnt ordered a sleep test, then you should suggest it. Do you snore or wake yourself up with a gasp or snort?
Been taking all the meds to go with A-Fib for 11 years. They say sleep apnea caused my heart to enlarge, and when they were doing the sleep study that found my heart racing I wasn't breathing for up to 3 mins.
Anyway The apnea sped my heart rate up above 300 bpm, and when they slowed it down it flipped into A-fib and has been ever since. They tried shocking and other stuff nothing has worked. Maybe one day they will give me a pacemaker. I know this digoxin has to be killing me even if it is slowly.