How can I clear my nose up?

I've been struggling since last night with a bad case of bronchitis. And my nose is so plugged up I have to breathe through my mouth, which irritates my lungs and makes me cough. I can't sleep at all and I have a cl tomorrow. The main reason I can't sleep is because I am unable to fall asleep with my mouth open. Which is the only way I can breathe at the moment. I'm really in a bind right now, even after taking tons of medicine and my prescription. What can I do? =(