You might have Eustachian tube dysfunction which a problem with the tube that drains the middle ear of fluid to the back of the nose. Any swelling of the noses and sinuses can cause the Eustachian tube to swell with resulting ear fluid and problems. Mastoiditis is not something that can be diagnosed with a CT scan as the radiologist can only tell if fluid is present and not if it is infected or not. That is why it is important for an evaluation with an ENT. You might need myringotomy tubes (ear tubes) to help with the fullness and pain.
Hello and hope you are doing well.
Looks like you have developed a sinus infection which has progressed to a throat infection as well. Sinus infections cause headaches. There are tubes called 'Eustachian tubes' which connect the middle ear to the throat, this balances the air pressure in the ears. This tube can get blocked due to infections of the throat, which can give lead to a feeling of fullness in the ears and the pain. This can also result in infection of the ears. Consult your primary care physician who will do blood tests and take a throat swab to determine the cause and prescribe appropriate medications. The blocked ears can be opened up by the valsalva maneuver, where air is blown into the cheeks against a closed nostrils, this sometimes helps to open up the tubes. Steam inhalations and salt water gargles can help. Take (OTC) tylenol (acetaminophen) or ibuprofen for pain.
Hope this helped and do keep us posted.
Sorry its like somone running water