@siosal The Eustachian tube keeps equal pressure between the outer ear and middle ear. If the Eustachian tube becomes blocked, the pressure is unequal and the eardrum is prevented from moving like it should. I did not know that it shrinks so thanks for that tidbit. It will warrant more research. I use Flonase on an occasional basis. It helps with my allergies. I use it if I don't want people thinking I have Covid, unfortunately.
It's interesting that you say that yawning helps with the tinnitus. I have not heard that either. Have you had your hearing tested? Hearing aids help tinnitus by increasing the ambient sounds more than what is internally generated.
Tony in Michigan