I'm also a level four COPD end of life. That sounds really harsh doesn't it. I have no one to blame but myself. I have many years of carefree living. At this point I can't walk across the room without stopping to rest. I also have an inogen oxygen mixer. I'm trying to learn how to use it and how to carry it as it is quite heavy and awkward. I also use a CPAP machine with an overflow oxygen machine in the evenings I did the mindful breathing techniques with the Mayo clinic which was quite helpful. I did one other program with the Mayo clinic and it was very supportive and helpful. I also have a home nebulizer and do treatments. Periodically. I have good days and bad days. I can only think our heavenly father Jesus Christ that I'm still walking and talking. I have a loving family and very supportive I would like to suggest and recommend that you never give in and you never give up.