Great news! I had an angel too...don't know how I'd get through without him.
Those strong drugs make my stomach turn, so I was on Regular Tylenol by day 4 or 5 post surgery. After awhile they did let me work in a little Motrin between Tylenol doses, but the anti coag clinic doesn't like that much. My biggest pain issue was the back flank one side like you mentioned as well as some other stiffness. I found that the best thing for most of it was walking and getting things loosened things up. And targetted deep tissue massages worked well too, but you need a good, well trained masseuse to make sure they understand all of the inner connections and avoid those that lead directly to your incision area. Often you find them assaciated with physical therapy offices rather than a spa for relaxation.