I have so many questions! Mainly frustrated that I can’t seem to get clear answers on WHY I have hypoxic respiratory failure that requires oxygen use. I have asthma and mixed connective tissue disease. I’ve just had transthoracic echo with Bubble study- normal. Vent perfusion study was normal.Both sides of diaphragm mildly elevated. X rays only show some acethelasis, mild. I’m scheduled for a blood gas at 100%. Is there a test that shows carbon dioxide levels? I am currently on medical leave from my job as a kindergarten teacher because I have used up all my sick days. I just want to sleep all the time, I have brain fog and can’t hold my thoughts very long. I’m so weak. I am planning to start pulmonary rehab next week. What can I do to help myself? What nutrition helps? When do I sleep and when do I push?