I am sorry your dog is having these health issues. She has certainly had a good life at 14 years old. I assume you have discussed this with your Vet to see what he/she recommends? Obviously, you know this is a condition that will gradually worsen and you don't want her to have no quality of life. Perhaps, the Vet might recommend a low dose sedative you could give her at night. You might try running a humidifier where she sleeps and keeping the area cool.