I had an asthma attack about 2 days ago wherein I experience difficulty breathing. We went to a hospital for a check up. They gave me prescription and still taking it up. I don't what to get confined that's why we went home. My oxygen saturation at that time was around 40. Here at home, it usually ranges from 50's to 70's. It improve a bit when I nebulize. We also bought a portable oxygen tank, it helped me reach 90% o2 sat when it's on but o2 sat goes down everytime I remove the oxygen. I still haven't improved much though.