Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain
bad breath coming from nose can be due to
sinus infection and as the sinuses drain through nose infection in sinuses can appear as bad smell in nose..
Other causes can be
post nasal drip, infection in nose, throat infections and tonsil stones and intake of high aroma foods like onion and garlic can also cause same problem..
I would suggest you to consult an Otolaryngologist and get evaluated and a thorough clinical evaluation and investigations like nasal
endoscopy can help in diagnosis and treatment of underlying cause can relieve the symptoms..
As of now you can do saline nasal irrigations.
Do steam inhalations with few drops of eucalyptus oil in boiling water..
Avoid excess intake of onion and garlic..
Drink plenty of water and maintain a good
oral hygiene..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.