For me, it really helped having a couple of flatmates I could rely on to know what to do if I had an attack. I get pneumonia fairly often, and when one bought triggered a huge attack - my first away from home - it was unbelievably reassuring to have someone stay up with me while I was waiting for the ambulance. She even called 111 when I was too breathless to talk. It also helped that I lived with student nurses. I made my friends aware that I couldn't be around cigarette smoke, and they were really supportive, always went away from me to smoke. People generally respond better than you might worry - although I did have one flatmate whose only concern about me having an ambulance was that it woke her up when the door slammed...