Why didn't the doctors do a PET scan to make sure they got everything? They should have looked for brain mets because that's where lung cancer likes to head to not to mention to the bone. They should have been doing scans every year, at least, to make sure she was still clear. I'd question their ability to really care about you mom. My mom was dx a stage 4 NSCLC without any symptoms, except a small pain in her shoulder (bone mets). They did a chance x-ray of the shoulder and found the tumor in her lung. Don't give up. You need to stay on those doctors and be a pest, literally. When they say "We need to do this.." say, "Why? What will that accomplish? What are my other options? What will the side effects be?" When they say, "This is all we can do for her." say, "That's not acceptable and I want you to find out another way." Search the internet, find information, call her doctors and ask them to explain it to you, what you found out and will it help your mom. They should be giving her something for the nausea and vomiting. They have pills for that! They have pills for every possible side effect in the book. Don't take no for an answer. Good luck.
Gretchen