Hello, It is difficult to distinguish between viral or bacterial sinusitis at times. When you have upper respiratory tract infection with common cold-like symptoms, sinusitis may be viral n origin. But when you have fever, headache with infection lasting for more than a week associated with mucous & cough it is bacterial in origin. You are suggested to see a dentist & get treated for the swelling in the root of the upper molars. Tooth infection triggers fever & pain due to inflammation. You can take NSAIDS, Combiflam, one sos to get rid of toothache but you need antibiotics. Get treated for bacterial sinusitis, your treating GP will give you analgesics, antibiotics, decongestants, etc depending on the severity of the infection. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Nupur K, General & Family Physician