Liz,
I know that this is haunting you and I am so sorry. I live every day with the worry that we aren't doing enough or making the right treatment decisions. I can't imagine, when you have a negative outcome like Robins, what your demons are, but I say a little prayer that you can find peace at some level.
I do know that you can fight this with what you are doing...posting your experiences will help us all make better decision and be more militant in our quest for a cure. You can only do what you know to do. When you gain knowledge, you gain power!
Sending you a hug today, Deb