I take it when you say "converted on my own" you mean with the aid of drugs/medications, you didn't simply convert without any help.
Dilt-CD is a new one for me, is it new, for AFib in particular? Or, is it another (of many) beta blockers?
I have never tried Flecanide but do understand it is a powerful drug. I'd give it a try but my cardiologist will not implement it without it being done under hospital supervision, I think that's two or three days in the hospital...maybe even in the intensive care...i.e., on a heart monitor that is connected and alarmed at the nurse station.
I am in permanent AFib, that's the bad news, the good news for me is my symptoms are simply that it restricts my physical activity to a lower level than I'd like, I simply get tired easily, in fact I do feel tired most of the time, but I think most of that is due to the medications I take, Metoprolol 100 mg a day. I was on 200 mg and dropped by on my own when I start getting a rash on my forearm, I'm experimenting with the dose level to see if the rash gets better. I keep an "eye" on my pulse rate to be sure it doesn't get too high.
Sorry, got lost talking about myself, hope there's something in there of use to you. To your question. it is my understanding that AFib gets more common and more severe as one ages. To me again, I no longer respond to electrocardioversion procedures which worked rather well in past years.