Yes, resurrecting this thread.
I just finished an 18 day tapering course of Prednisone with the highest dose being 55mg, and wound up being hospitalized w/ serious side effects/withdrawal symptoms.
Three hours after what would have been the next dose (had I not finished the taper), I felt strong palpitations. These seemed to resolve after a few minutes. The next day, I felt extremely tired the entire day, but chalked it up to vague Prednisone withdrawal sympoms. I went to sleep very early, then woke up around midnight with my heart racing and more strong palpitations. These did not resolve, even when I did the deep breathing, "be calm" thing. Worse yet my pulse felt wildly irregular. Not regular with some weird beats thrown in, but totally erratic. I got myself to an ER ASAP where I was given an egk and diagnosed with atrial fibrillation (first episode in lifetime) with my pulse swinging between 120 and 150 beats/minute. They gave me a calcium channel blocker to slow my heart beat and attempt to restore the normal "sinus" rhythm. They wound up admitting me. The heart did eventually convert back to normal rhythm, but it took quite a few hours. While waiting, I learned that a fib is a serious problem because it greatly raises the risk of stroke.
I've since learned that both my parents suffer from atrial fibrillation, but they had their first symptoms in their 70s, not when they were 51. In other words, I'm thinking that a Prednisone withdrawal might trigger a fib in those who are already predisposed.
Are you sure it was related to prednisone withdrawal? Might it have been an unfortunate coincidence? A lot of people have A fib without knowing it. I hope your a fib stays away. I don't have a fib, but I've had a rough few months of electrophyisology/cardiology issues, and I know frightening and anxiety-inducing that can be. You get caught in cycle of cardiac symptoms that heighten anxiety, and anxiety that exacerbates your cardiac symptoms.