Hi Ashok and thank you for choosing HCM to post your question. I read carefully your question and in my opinion : fever,pain in the left nostril and continuous cough correlate with the clinical picture of acute bacterial rhinosinusitis.Nasal mucosa is simultaneously involved and sinusitis rarely occurs without concurrent rhinitis. If I was your treating doctor i would prescribe a course of 14 days of antibiotic such as Amoxicillin/clavulanate or a second or third generation cephalosporins.Other classes of antibiotics maybe used also . Treatment includes also adequate drainage of the sinuses.Options for medical drainage are medications such as pseudroephedrine or phenylephrine for 10 to 14 days.You can use also topical vasocontrictors (oxymetazoline hydrochloride )for a maximum of 3 to 5 days. Consider also adequate hydration,smoking cessation,balanced nutrition. Hope my opinion can be a help to you. Wish you good health. Kind regards Dr.Dushi.