Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain persistent smell of ammonia in nose along with a history of loss of sense of smell and taste can be due to causes like
Phantosmia or
Olfactory Hallucination and it can occur due to conditions like
sinus infection, nasal polyps,migraines, problems associated with
central nervous system like stroke, epilepsy etc..
Other causes can be Kidney or Liver diseases..
I would suggest you to consult an Otolaryngologist and get evaluated and a thorough clinical evaluation and investigations like nasal
endoscopy and MRI scan can help in diagnosis and treatment can be planned accordingly..
As of now you can do saline nasal irrigations, decongestant nasal sprays,steroid nasal sprays..
You can be advised medications like sedatives, anti-depressants and anti epileptic dugs depending upon the cause..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.