Doctors, my sister( age 18) is right now experiencing problems with breathing. It started for the first time in the morning, and now we are trying to fall asleep, and every time she falls asleep she wakes up due to shortness of breath. She doesn't have asthma or allergies, and today we went to the hospital and doctors checked her heart and lungs, and did blood tests, and everything was perfect, so I need some immediate solution right now to help her breathe normally. I am 19, and our parents are out of town, so I need some help, because we don't know what to do and I am pretty scared. Thank you for your help in advance!