21 weeks and with the flu

Hi everyone! I am 21 weeks preggo and Thursday I was diagnosed with flu. My ob prescribed Tamiflu which I have been taking every 12 hours. Fevers have subsided, and body aches as well. Now, the major problem is this HORRIBLE congestion. I cannot breathe through my nose AT ALL. My lips are cracking from how dry they are. And my throat is killing me from irritation so I can barely sleep. Any ideas what I can take? What is safe so that I can get a good nights sleep?