Hello and Welcome to ‘Ask A Doctor’ service.
I have reviewed your query and here is my advice.
As per your complain the symptoms of strange smell through nose when bending down along with nasal congestion
seems to be due to a condition known as Phantosmia..
It can occur due to a number of conditions like nasal infection
and polyps, migranes, Oral and dental infection, smoking habit, condition related to Nervous System like Parkinsonism, Alzimer's Disease, Stroke, head injury
However your condition seems to be probably related to sinus infection
I will suggest you to consult an Otolaryngologist and get evaluated and along with clinical evaluation investigations like Nasal endoscopy, MRI, CT Scan etc can help in diagnosis and treatment can be planned accordingly..
As of now you can do saline nasal irrigation
, steam inhalation with few drops of Eucalyptus oil in water,chew flavoured sugar free chewing gum and limit intake of high aroma foods like onion and garlic..
Hope I have answered your query. Let me know if I can assist you further.
Dr. Honey Arora