[BonnieR]

Heidi, this is a very big question you ask. And a big decision for you to make. Have you discussed any of this with your oncologist and treatment team? I think most everyone would agree that you should seek out a second and even third opinion about all your treatment options. If you are in the care of a cancer center they often have patient advocates, group meetings and counselors. Most have "tumor boards" where your case is presented to a variety of disiplines all at once and they discuss options among themselves to share with you.
Contact the Cancer Society. Make a list of all your questions and concerns to ask your oncologist. Put it in writing and have someone with you to hear the replies.
I had a bilateral mastectomy but am WAY older than you.

It would be helpful if you put your specifics here in your signature so we would know more details.
Keep the faith. We will support you.