The ablation can do an excellent job in helping out. I had one in '98 and it made a significant difference. They generally take about 2 hours but some can go longer.
I too have a Guidant ICD (recently installed) as a protectant against VT or VF. Plus I have an artificial mitral valve, a dissected aorta from heart arch to femoral artery, and had a quad bypass in '97.
Still kickin' with a handful of pills as well......To paraphrase DuPont----Barely Living through Chemistry
Utah's been fightin' for years and I'm sure he has some more left in him......Good Luck to ya'!!