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.