A few days ago, I was at a family friends' house and it's an old farmhouse. It's dusty too. Woke up the 2nd day with a sore throat and now 2 days later, i have a cough, excessive saliva, nasal congestion, occasional sneezing.... I don't feel like I'm going to be sick and my sore throat is gone. The excessive saliva is the annoying part...how can I lessen it?