Help. Doctor has changed mind again. He is now checking my insurance to see if it will approve me trying Opdivo. I have read about the side affects and am worried. Has anyone tried this immunotherapy drug? I read an article recently that Keytruda was doing better for certain people but it appears I didn't qualify (not the right markers) for Keytruda. Just a reminder I'm 4th stage lung cancer, has gone to brain (waiting to do next brain scan end of December as don't know if tumor is gone and have scar tissue or if tumor is growing). Last chemo was Alimta which I had such bad chemo fog that I had no quality of life...did get me time but at a large price. Help if you have any information on Opdivo. Thanks.