I feel for you. So amongst all the people here who will howl about, "not fair," "shouldn't have to," "outfox the system with a doctor's note," I will be someone who tells you how to make it work. Not a shill, just a seamstress who is devoted to helping others who don't have an option about wearing a mask in order to get back to work. Mind over matter. You are strong, you CAN do what you must. Think about how navy seals train to be able to withstand extreme conditions and discomfort. Think about how firefighters do the most physically demanding, high stress work, all while wearing 50-100 pounds of gear. This is mind over matter: The body will do what the mind wills it to.  Invest in your OWN masks. Have someone sew a custom fit model (get several, so you can clean and disinfect between uses) for you. It will be more comfortable and you can get one that fits closely around the edges but NOT flat to your nose/mouth, which will give you more breathing room, so hopefully feel less claustrophobic. If you don't have access to that, dm me and I will help you.