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This is Dr. David
I take it you most likely have COPD or emphysema
did you smoke before?
you should ask to see a pulmonologist and get a pulmonary function test and diffusion capacity measured.
you should get your pulse ox levels checked when you are walking and see if it drops down to low 80s or 70s, if so, you need home oxygen therapy.
your insurance should pay for home oxygen therapy if you have documented drops of your pulse ox levels into the 70s when you walk or exert yourself.
I'm surprised you don't have home oxygen already
let me know if you have questions.