Wow Deb! 250mg of digoxin seems to me to be an awful high dose! And your low heart rate is most likely the result of that.
I, like Missy, take .125mg of digoxin daily. In fact, after my two surgeries in 1975, Lanoxin (digoxin) and coumadin were the only medications I took for approximately 26 years!
When my long-time cardiologist retired, the new cardio, took me off of it for no good reason, other than
"we are going to do things my way"! What happens? A year later, I had to be taken to the ER so the doctors could shock my heart into normal rhythm because my heart went into hysterics, beating so wildly, I thought it was going to stop! That's when I decided to give that stupid cardio the boot!!!
I don't know why your cardio has you on such a high dose but that is something that I would certainly ask him ASAP because your low heart rate is most likely the reason you feel so tired and blah!
Give him a call and make an appointment to discuss your issues.
Hope you get answers soon and get to feeling better!