It looks like ETD( eustachian tube dysfunction) if not because of otitis externa, you are not a diabetic right?
Also do you have any history of fungus (otomycosis)
Next Steps
Impedance audiometry can be done to check the compliance of the eustachian tube. Also oto-endoscopy to see the canal and tympanic membrane
Health Tips
You try taking steam inhalation 3 times daily. And further treatment can be decided based on the probable cause