See a naturopath. One of our employees became ill and was suffering for almost 2 years with a runny nose. She would speak to people and her nose would just start dripping. I experienced similar myself being a mold inspector and going into many homes that are infested without protection. She went to a naturopath who recommended that she try going on just greens. I personally subscribe to a vegan diet, and as she was doing the diet, you could see the blood cells changing in her blood tests. And her runny nose went away. She lost a lot of weight as well in the process. It rebuilds the immune system which helps it fight off colds, and sinus buildup and things like that. Try juicing as well.
Hope that helps.
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