Watery discharge from nose cannot be cough coming out. Discharge from your nose which is watery, colour less suggests rhinitis but since it is smelly, infection is the cause. And as you are suffering from chronic sinusitis from a long time, discharge from nose due to sinusitis can get swallowed and slowly cough begins which suggests bronchitis.
DHMS (Diploma In Homeopathic Medicine and Surgery), DIHom (London)
You are already taking medicines which are giving you some relief, in order to have further improvement you need to consult homoeopathic physician who can plan a constitutional treatment with holistic approach, which can only increase your body vitality I.e your immune system.
As based on this report, you have to mucosal layer thickened and blockage of sinuses. This can be corrected with a FESS (functional endoscopic sinus surgery) and medication cannot give permanent relief.
Thanks for your query on Lybrate
"As" per your clinical history is concerned do a detailed clinical examination by your Doctor[ENT] and do a nasal endoscopy and discuss about surgical treatment and it is a minor repair of 30 mins only and there is no future complication at all.
Hope that helps.