Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern.
As per your complain and presentation of symptoms it seems that the
sinus infection is not yet cured completely leading to bad odour as bacteria and debris present in mucous will cause foul odour..
You need to consult an Otolaryngologist and get evaluated and he can also advise you a Nasal
Endoscopy to be done to rule out for any polyp or tumour in the sinus..
You will be advised to take antibiotics, anti-allergics like
Benadryl , decongestants lie Sudafed and mucolytics like
Ambroxol to loosen the mucous..
Doing steam inhalations and saline nasal sprays will help..
Use a humidifier in your room..
Sleep with head slightly raised so that the sinus can drain..
In case if endoscopy shows any tumour or polyp in the sinus
surgical treatment has to be done for removal..
At times draining the sinus also needs surgical intervention..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.