Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern.
As per your complain it seems that you have infection in your sinuses leading to
Sinusitis and as the sinuses drain through the nose there is a bad smell in nose and
post nasal drip is causing foul taste in mouth..
You should consult an Otolaryngologist and get evaluated and in case if sinusitis is confirmed as a diagnosis he can advise you to take antibiotics like
Azithromycin or
Augmentin, anti-inflammatory painkiller like
Ibuprofen, saline nasal sprays, steam inhalations.
I would suggest you to add a few drops of eucalyptus il in the water used for steam after it boils up as it will add up a fresh breath..
Gargle with a flavoured antimicrobial mouthwash for masking bad smell in mouth..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.