SKLG
"My pulmonologist is a jerk and thinks "mild functional limitation" in a 23 year old is okay. It's also apparently fine if my oxygen drops to 94% on a good day for me. Just walking for six minutes. Who knows what it is on a bad day? We don't. I can tell you it has dropped to the 80s before. "
I personally think it's time to find another pulmonologist. Your dr clearly don't think this is serious. Do you use a peak flow?