Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain congestion in the head/teeth and cheeks along with
post nasal drip are most commonly due to
sinusitis caused due to infection and inflammation in
sinuses..
While it can also be due to allergies..
Nerve damage does not probably seems to be a cause..
I would suggest you to consult an Otolaryngologist and get evaluated and a clinical evaluation and investigations like Blood tests can help in diagnosis and ruling out allergies..
You can be advised a course of antibiotics, anti inflammatory painkiller like
Ibuprofen, anti allerics like Levocetrizine..
Along with it do warm saline gargles, steam inhalation and use a humidifier in your room..
Do warm compresses over painful area..
Avoid chilled food and air conditioned atmosphere..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.