Well that's just shit. We're with you all the way Sally. As everyone has said, take it one step at a time. Yes, you're in for treatment you neither wanted or expected, but taking a breath and girding your loins sounds like a bloody good thing to do. It is what it is and determination is a good quality to go in with.
I don't know if this is the same, but in 1986 my mother was told her breast cancer had moved into her lymphatic system, ie beyond her lymph nodes. They hit her with the strongest chemo available at that time and she is still with us today aged 84. Currently holidaying with one of her besties in Coolangatta, eating prawns, drinking champagne and torturing me with gorgeous beach sunset photos!
Hang in there Sally. Big big hug lovely. K xox