Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.
Your symptoms appears to be due to jaw joint related problem also known as TMJ/TMD.
It can cause difficulty in opening mouth too wide and can also cause pain in chewing.
As the jaw joint is present in close proximity to ear, therefore jaw joint related problem can also cause earache, but clogged feeling and difficulty to hear well can be due to blocked Eustachian tube
So my suggestion is to consult an Oral Physician and get evaluated and a Panoramic x ray
can be done for confirmation of the diagnosis.
Also get an Otoscopy of the ear done.
For now take muscle relaxant
like Chlorzoxasone and take soft meals.
Use decongestant nasal sprays like Otrivin
Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Honey Arora