My oxygen is running at 82-86 daily, I am always tired and get very fatigued instantly. I have been checked by heart doctors and pulmonary doctors. They tell me there is nothing wrong and live with it. I don t call this living. I am 57 years old , 5ft 6in. tall and weigh 210. I have gained 15 pounds this winter, I have no energy to do anything. 2 years ago they put me on a C-PAP thinking that would help,still nothing, was rechecked this month with no new results. am getting very annoyed. Did a stress test. saying I have low level o2 when I walk slow and medium but when I work harder the o2 improves. What could be causing this. I need answers.