Update after seeing the ENT-- she's very convinced it's allergy related, as I tested positive for all the allergies on my blood panel. The highest/most concerning one is for mold-- normal range is equal to or lesser than 0.36 kUa/L, and while some of my allergy levels were above range for some (1.5, 2.6 etc.) the one for mold is 49.8 kUa/L which is extremely high. I live in an old house on a ranch, and would not at all be surprised if there's mold here (in fact, have always wondered about it as we have roof leaks, weird/bad smells in the summer, etc.). While structurally my sinuses and innner ear look ok, she thinks the allergy is causing inflammation in my inner ear which could cause my symptoms. So today I was prescribed a new nasal spray to use in addition to Flonase, which is called Azelastine (it's a topical antihistamine in nasal spray form, whereas Flonase is steroidal). My boyfriend and I also ordered a basic mold test kit...and of course this put together with my other positive allergy tests makes me want to move to a new place more and more!