@tiss -- I'm sorry that you are having such a rough time with your breathing. It must be very disconcerting! As a lung cancer survivor I really know how this feels. Are you sure that you inhalers don't work? Has your O2 been measured before and after you inhaler? Rescue inhalers do take a moment or so to work, esp if you need one out exercising. Have you waited long enough for it to work? What do you doctors suggest?
CT scans pick up many more details than chest Xrays.
https://floridachest.com/pulmonary-blog/chest-x-ray-chest-ct-scan-differences
I hope that you will reconsider using your O2 at home. If you limit you O2 intake other organs can suffer and the results might not be what you want to look forward to.
https://my.clevelandclinic.org/health/diseases/17727-hypoxemia