I was like you and had the cancer in my left boob. After lumpectomy and chemo I decided to have the right boob taken as well. I couldn't stand the thought of cancer getting that one after going through all this shite! So off with them both. My surgeon wasn't too keen on taking the right, supposedly healthy, breast as he believed there wasn't a good medical reason. Well there is a bloody good mental reason for it, I don't want to be scared the rest of my life wondering if a lump or bump I feel might be cancer. Don't get me wrong, he was very good about my decision, he just wanted to be sure I understood what I was about to do. Good luck with yours.
Love Janey xxx