I've been living with severe COPD for years & am on BiPAP (w. O2 bleed) & HiFlow O2 concentrator. I'm educated on IPAPA, EPAP, and Vt so BiPAP therapy goes well, but when I transition to my 02 canula for daily activities, I can't breath but in gasps unless I stay completely still for like 5 minutes -- like I can't just switch from BiPAP to Canula and go on about my merry way. It's like my lungs need time to make the transition. Has anyone else run into this problem or know a solution?