Hello and welcome to HealingWell. I am so sorry you had such a frightening and disappointing time with your ablation. I cannot imagine how awful this must be for you.
Any chance you could get a second opinion with another cardiologist ?
I can understand why you are having symptoms of depression and I would like to refer you to our depression forum also as sometimes it helps just to talk with others who are feeling down and sad about what life dishes out to us at times.
Again I am sincerely sorry to read your post. I do hope someone with some experience will come along with words of wisdom for you.