I'm experiencing kind of similar symptoms. My H started like loudness H. It was very mild and I could feel I was improving as the months progressed. It was almost completely gone until I went to have drinks and there was fairly loud music (didn't bother me at the time though). A few days after this event, I started experiencing the facial symptoms: pressure below my eyes, quite severe, I guess like sinus pain and also pressure/tingling around my jaw. Also extreme pressure pain right beneath my eyebrows.
Then I experienced a second setback due to the fireworks at December 31st, while I was inside my house. My symptoms worsened hereafter. I did my best to stay in as much quiet as possible ever since and I guess improved quite a bit. Fast forward to last weekend: I spent a few hours with my baby nephew who was crying constantly, really felt that the day after. Last Tuesday I had a cleaning at the dentist (didn't use earplugs as I thought it wouldn't be useful due to the occlusion effect) and now I've reached an absolute low in my symptoms. Constant facial pain, tingling, so much that it's making me nauseous. Also extreme sound sensitivity, can't even leave my house.
Sorry about venting: I feel really hopeless as I know there is a connection between all these symptoms, but not one doctor understands or is willing to figure it out. Or they just genuinely don't know.