Like Becky I was forty six and just finished chemo whn I had my ooph, but I had no side effects like your Gyno said.
It was the easiest surgery ever and apart from some bruising for a few days I felt fine the next day, and have had no problems since!!!
I should add I've been taking arimidex for four years and do have the usual achey bones but nothing too bad or that I can't handle and still exercise and do all the things I used to.