yup along with a few other sinus symptoms mine are identical to yours. it causes me a lot of anxiety, especially the off balance, dizzy feeling. its probably eustachian tube related cause that regulates ear pressure to your middle ear, which of course is next to your inner ear, which is responsible for balance. i was diagnosed with allergic rhinitis and postnasal drip. so maybe you caught a new allergy and thats how its affecting you??