Andrea,
I know what it's like to hear the words that your loved ones cancer is back, but I haven't been told that there is nothing they can do yet. My heart aches for you and what that may be like. I understand how hard it is to be strong when you see your parent go through a difficult time. Your mom sounds like one strong lady, and I'm sure she has raised one strong daughter, even though you may not feel very strong right now.
Please know that you are not alone and that you and your mother are in my thoughts and prayers.
Joy