What Are The Chances Of Recovery From Asthma Requiring Oxygen Therapy?

hello, i have had asthma for over 32 years now, since 3 y/o. over the past year my symptoms have continued to worsen, i have been hospitalized 3 times in less than 6 months....i am dependant on oral steroids now, as well as the largest dose of inhaled steroids (Symbicort) I take neb tx's with xoponex and atrovent 6 times daily, I have steroid induced diabetes, and was just d/c'd today from hospital on home 02 at 2L via NC, my sats were 79-82% on room air with ambulation....my question is once you are home 02 what are the chances of every coming off ? my CT of the chest was negative and my CXR's continue to only show bronchitis....I watched my mother die a horrible death with emphysema in november...just wanting to know what my chances are of ever leading a normal life again....should I go on disability as I have a job which requires a lot of running around....any advice would be greatly appreciated....I also have RA if this makes any difference at all....Thanks