Hi welcome to the health care magic You are having sinusitis like upper respiratory tract infection It could be viral or allergic also rather than bacterial you are suspecting Investigate with CBC for further guidance of treatment If neutrophilia present and symptom not improving than start cefixime like antibiotic ... You can take benadryl or diominic DCA like decongestant drug for Symptomatic relief Steam inhalation done with added one drop eucalyptus oil in hot water for three times a day Drink hot water and ginger tea for soothing Take one tsp ginger juice with honey daily If it is allergic than fexofenedine like drug given For gastritis secondary to antibiotic take omeprazole capsule along with medication With keeping this in mind consult physician or otorhinolaryngologist nearby for examination Hope your concern solved