I know what you're going through, been there myself. I had radiation instead of chemo and have been in remission for several years now. My lung function sucks so if I'm moving around I use supplemental oxygen most of the time but can do slow short walks w/o it. Heck, it takes me about 20 minutes to dust off my Challenger, but I still enjoy what I can do. You can beat this, just stay strong and keep a POSITIVE attitude. Don't focus on what you can't do, think Talk to your oncologist about what vitamins or supplements can help while you fight this off. Good luck, keep checking in!