When I used O2 for the first time last year I felt devistated. I thought of it as another "setback" & 1 foot closer to the grave. I came to realize with support from my doctors & office staff as well as my personal experience that it does help. That it eases the struggle to breath. So this time around I am suppose to be on O2 24/7 until further notice basically. I am getting the portable gadget tomorrow, but had ???. Tho I am not gasping for air like I was last year or last week, I definitely feel the need to be on O2. I can get around doing small things without it, but I feel a big difference when I have it on & doing the small things. The big things is a must. Anyway......all this time I am thinking that its "normal" to breath the way I do without the O2. Once adapted (unless I am really bad) to breathing a certain way I dont feel the need for O2 UNTIL I use it. Then I feel the difference. I keep repeating myself sorry. My basic ??? is how much "tolerance" or lack of do you or should you deal with before relying on O2. Like I said I can get around without it, but feel a BIG difference if I use it. Is this normal? Is this to be expected? Is this something to worry about? Does anyone understand my post???!!!!!!!!!!!