I am so sorry. My heart aches for you and your mom. I'll keep you in my prayers. My father died of small cell lung cancer. I was diagnosed with non small cell lung cancer. I hope they are keeping your mom pain free. You will know by looking at her if she's in pain. The crease on her forehead, the tenseness, when she's not able to express it. Please be her advocate, as there is no reason for her to be in pain in this day and age. Hold her hand, love her, talk with her (they say hearing is the last to go) and let her know how much she's meant to you. Oh I'll keep you both in my prayers dear one. Love and strength being sent your way.
God Bless you dear one, as this will be a most hold road you will travel with your dearest mom.