I have had 2 mastectomys, as they found cancer in both breasts, one a month after the other! I am also living flat. Do you know about the facebook group flat friends? It's for people without reconstruction.
I've not had the genetic testing yet, am waiting to hear from them, but as my aunt has had breast cancer 4 times (in both breasts) I suspect it is genetic, even if it's not one of the current genes they test for.
Am very happy living flat, only get foobs out for special occasions :-)