kaysav05 is right, a year of congestion's not normal, and could be allergies. Allergy skin testing is very helpful to tell.
Mycousin has that same problem, she finally went to Dr., the diabetic Dr. did a allergy test and turns out that with diabeties you can develope allergies, almost overnight. Better get ya some allergy meds or get into the Dr.
Good Luck, I hope I helped.