YE GODS. You have my utmost empathy! I definitely get hearing issues when the atmospheric pressure changes. Speech can sound weirdly “tinny” and flat. On top of which my own 24x7 tinitis is louder and more tuneful: Bong! BONG! Bong-bong-bong-BONG!
I hope you get some answers to this curious phenomenom you’re experiencing. Drugs may cause MORE of the issue if you are sensitive to it. By the same token, I’d probably try anything - even old wives’ tale - if I knew of one. Antihistamine? Warm compresses? Massage the ear?
Keep us posted!