O2 did exactly the opposite for me.
I had breathing problems where my breathing was laboured in the early part of 2007, in the end I ended up on 2 litres of oxygen per minute for 24 hours a day...
I didn't notice when I didn't need it anymore so I was overdosing for quite some time, I finally came off it in February of this year and I can say I felt a heck of a lot better.
O2 doesn't help ME/CFS... perhaps it was the different kind of air that helped.
For instance I find our local forest a godsend for making me feel a little better, it's just the fresh air in the trees that does the trick
