I went to a Pulmonologist a few weeks ago and was set up on oxygen last Friday, as my oxygen level when I went to him was 88l. I'm a 66 year old female and over many years have gained weight due to doctors refusing to do surgery on my knees so I could walk. When we moved I found a great surgeon that did the surgery and it was only because I had to have additional surgeries after that that I gained another 20 pounds. Thankfully I can walk and I have a treadmill. I'm scared to death because I have to be on oxygen 24/7 but is this a death sentence for me? If I lose weight will I have to remain on oxygen? for the rest of my life? Does this mean I can't live another 15 years? If I go out to a store do I have to worry about somebody that was smoking throwing a cigarette butt on the ground? Or pumping gas? Please help. As I said I'm scared.