About a month ago, I experienced my first major exacerbation which put me in the hospital for a wee. When I left the hospital my O2 levels were low so they put me on oxygen. At that time, I felt very weak and tired. As time has passed, my O2 levels have significantly improved and I rarely use oxygen. I have regained most of my strength. However, I am still struggling with exhaustion. I feel as though I could sleep all day, have a very difficult time getting out of bed in the morning and am having difficulties being productive at work. Anyone have any idea why the tiredness continues despite my O2 levels being good? Any thoughts would be appreciated.