My father was an attorney for the Medical Protective Association. I heard a lot of medical horror stories from him, but few that sucked as much as yours.
Now it occurs to me, I should mention Mrs. Anderson, a very silly lady, who was a friend of my mother's. She also had both breasts removed. I don't think she thought much about it, because she was a widow. Well, she went to her high school reunion ten years ago. She met a man there. They're still together. He doesn't seem to mind that she's a titless wonder.
Your doctor's mistake still sucks. He was seriously despicable. They do make very comfortable breast prosthesises these days. I'd suggest getting a set to act as bumpers.