Welcome to this club no-one wanted to join @HelenlovesSnoopy. How fortunate that you did decide to have the mammogram as much later and they may not have had such a good chance at saving you.
Be your own advocate at all times and don't stay silent or be a martyr - you are number one and you know your body. Always ask, ask, ask.
Your Christianity will no doubt provide a feeling of serenity and being cared for.
If you are offered assistance at all do take it as even the smallest thing does help.
Just take it one day at a time - you will find you are stronger than you think.
All the best. 💖