Erica, my mother had cervical cancer over 30 years ago and lived to be 90 years old. I know that the possibility of not having children is overwhelming right now, but remember there are so many alternatives these days. Your health is the most important thing.
The rejection of your mother and her family is their loss, not yours. It sounds like you did everything you could and more than you should have had to.
No matter what your doctor tells you, I would get a second opinion. Just for peace of mind, if for no other reason.
Hang in there, God only gives us as much as we can handle. You will be in my prayers.
Pat "Ma" Green