How evaluated,do they ask us to blow something,but if they feel I need support of oxygen,how long will I be on support how can I increase my lung capacity, please tell any one exercise to do so, I am now scared, to walk alone, feels like deprived of O2, scared for no reason ,20yrs back my aunt was 67,she on O2 support,stayed for 2yearsand passed away,.Will I be back on my feet?Can I too improve , when can all go right.