Lately - the past 6 weeks or so - my allergy symptoms have increased and a new one has appeared. In addition to runny eyes, nose, etc., I have to clear my throat constantly and in the middle of the night I wake coughing, to the point of almost gagging. Also, my saliva is extremely thick and hard to swallow. The combination of the cough, the thick saliva and running nose is killing me (not really) but my dad had throat cancer so I am concerned.