GO MARNI!
I just want to add that I had a LARGE breast reduction a few years ago now. I started back about two weeks after the surgery with the stationary recumbent also. For me, the fatigue wasn't so much that I lost fitness so quickly, it was because my body was putting so much energy into recovering from the surgery that there wasn't that much left to go around. I know a BR isn't the same as what you had done, but I just wanted to give you some encouragement. You haven't lost that much fitness, it will come back very quickly. YOU ROCK!!
Trek Madone - 5.5 -Brooks B-17
Trek 2.1 WSD - Brooks - B-17 - Trainer bike;
Gary Fisher - Tassajara (MTB) - Specialized Ariel