Hi..
Thanks for the query..
Sinus plugs are nothing but mucous plugs or thick mucous that gets accumulated into the sinuses leading to congestion..
In case if you are not relieved with surgery of sinuses I would suggest you to consult an ENT Surgeon and get evaluated, he can advise you to get investigations like PNS view x ray or MRI scan of sinuses and get treated accordingly..
You can be advised to take a course of antibiotics like
Augmentin, anti-inflammatory painkiller like
Ibuprofen, anti-allergics like Levocetrizine,oral decongestants like
Phenylephrine, Mucolytics like Ambroxol, decongestant nasal sprays like
Xylometazoline, steam inhalations, saline
nasal irrigation and use a humidifier in your room..
You should avoid chilled foods and air-conditioned atmosphere..
Hope this helps..
Regards.