You say patulous eustachian can have an echo? So you don't have to have autophony to have this condition? If I breathe real hard I hear air coming up into my ear. Ent said I don't have it but I'm not sure I agree due to the symptom. I don't have fluid in my ears so I don't know what else it could be. My tube is popping a few times a day as well.
I have something just like this ever since I had an ear infection 3 months ago. Does your eardrum vibrate as well? It sounds like there is air in my ear if I breath real hard. What other symptoms do you have? I think I have patulous eustachian tube dysfunction.