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I read your entire history and understood your problem. Autophony is the unusual hearing of one's own voice and even breathing sounds.
You have two issues:-
The treatments offered to you also shows the same thing. Let us understand the problem first.
Eustachian tube is the tube that connects the middle ear to the throat. Normal functioning of eustachian tube is essential to maintain proper ventilation of the ear. If it does not function or malfunctions, it leads to sense of fullness or heaviness in the ear which you have been having.
Patulous eustachian tube is a condition in which the eustachian tube remains open most of the time. It recovers by itself over a period of time. However, if it persists for a long time, in that cases minimal cauterization of the opening can be done endoscopically. But this is rarely needed.
Regarding malfunctioning of the tube, a small procedure called myringotomy (surgical procedure of making a small incision in the eardrum to relieve pressure) and ventilation tube insertion in the ear will help, as you are suffering for a long time.
In this, the ventilation tube is fixed in the ear and that serves the purpose of ear ventilation. Till then, you will have to continue steam inhalation at least once a day in the evening for 3-4 months.
You will also need to take a decongestant tablet. Take tablet Febrex plus one tablet in the evening for 10 days followed by tablet Montair Lc once a day for one month. Avoid exposure to air blast and cold exposure.
For further follow up, consult an ENT otolaryngologist online --> https://www.icliniq.com/ask-a-doctor-online/ENT-Otolaryngologist