Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain the symptoms have been diagnosed right of having sinus infection or sinusitis but it seems that along with it there seems to be upper respiratory tract infection or bronchitis or lung infection along with it.. I would suggest you to consult an Otolargngologist and get evaluated and he can advise you investigations like sputum culture, chest x ray, PNS Viiew x ray or MRI scan to help in confirming the diagnosis and treatment can be done accordingly.. You can be advised to continue antibiotics like Cephalexin, anti allergics like Levocetrizine, steroid spray like Fluticasone.. You can also be advised to take cough suppressant containing Dextromethorphan and expectorant like Gueifenesin.. Do steam inhalation and use a humidifier in your room.. Take decongestant like Phenylephrine.. Do warm compresses over chest.. Sip on warm water and avoid spicy and chilled foods. Chew Vitamin C pellet daily.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.