It could be allergies to dust mites or it could be caused by Gerd. If it’s been 10 years, it could be a chronic condition now. Have they checked for nasal polyps, enlarged adenoids or deviated septum? Have you ever been allergy tested or had an EGD. You can also have something called silent reflux without any other symptoms. You could try elevating the head of your bed and placing a mattress cover over your mattress. If you don’t see any improvement, you could ask your provider about trying an acid reducer. They sell it over-the-counter.