My boyfriend has been sick for the past two weeks and keeps getting worse. He has a stuffy runny nose, a really really bad cough but isn't coughinf up anything, he'll get cold sweats and one minute he'll be burning up and the next he'll be freezing, and he all of a sudden couldn't breathe for a minute like he was suffocating or something, and has a sore throat, and keeps losing his voice. What can he do to help get better without having to go to the doctor?