Sinus congestion???

Any ladies have suggestions to treat crazy congestion during first trimester? Completely stuffed up for 2 weeks now, which leads to nasal drip and awful coughing. Tried drinking loads of water and cutting out sugar, saline nose spray, bed rest over the holidays (note: never had flu symptoms like fever or muscle aches) etc...I'm losing it! I cough so hard I'm afraid I'll cough harm into my growing baby!!