@mrbill I have made and given away hundreds of masks, mostly to seniors who often have underlying health conditions - including some friends with COPD. They general find they are able, as Merry suggested, to tolerate the 2-layer cotton masks. See if you can find a friend or acquaintance who makes them. The others that work for people with breathing issues are the blue, usually pleated, surgical style masks. These have become pretty widely available by the package or box in stores and online. Another option is a bandana folded into a triangle and tied over nose and mouth. While not as effective as an N-95 mask, these are all better than no mask.

One caution - disposable masks should be discarded in the trash after use, and cloth ones or bandanas washed thoroughly with soap and water and rubbing of the surfaces then allowed to dry (no need to be fancy here - soap and water plus friction kill the virus.) Please don't put masks in the oven or microwave to "sterilize" - unnecessary & potentially dangerous.

I hope one of these will work for you.
Sue