Stuffy nose issue

I have had "allergies" since February. I have been to the doctor several times for it and have been given nose sprays that don't really help. I have so much mucous that I go through a box or so of tissue a week. Bloody noses all the time and other gross issues. I finally went to the Allergist last week and got the allergy scratch test. I'm not allergic to anything. He suggested more nose spray. I fought back saying that they don't help and lead to bloody nose. He convinced me to try a sample for two weeks. I gave in.

The negative allergy test had me very plagued at what could be causing the mucus issue so I started looking up things on the (sweet sweet) Internet. I found several people with the same issue that are taking the same drugs I am for my tumor. Huh.. WTF? The doctors didn't put this together? I am going to have to talk to My oncologist about it Friday and see what he has to say.