Not sure I understand the quote from your EP, about being a plumber, not an electrician.
AFig and most (all?) heart rhythm problems are electrical-based, thus the EP Electrophysiologist is an "electrician" not a "plumber". Maybe you got it backwards and he suggested there is some blockage, hope not.
All the above aside, I think it can take time, even months, to fully heal from an ablation, and sadly it sometimes doesn't work... thus a second ablation is on the "table".
Keep positive, and let the healing do its best, you may come out ok, and with a fix you can get off of coumadin.
Ask ALOT of questions and make your EP stay there until you have a clear understanding on whats going on and what to expect. All these Cardo and EP doctors have all this infomation in their heads and unless we ask the questions, its a dont ask dont tell kind of issue. Especially if the results are not bad or are normal. Your level of care meaning $$$ for the visit will go up but you will have a clearer understanding of whats ahead for you and that is all that matters anyways. Good Luck.