Discussion - Oxygen

My name is Cristina Hepner and I have Limb Girdle Muscular Dystrophy.  I have a question about low oxygen levels.  About 6 weeks ago ,the pulmonary doctor told me I had low oxygen and wants me on it 24/7.  This is a hard thing for me to accept because I feel fine, not out of breath and function like I always have.  This is so overwhelming to me and I am so confused.  Has anyone had this problem?  Being tethered to this machine is quite a burden on me.  I