hi there, your symptoms are suggestive of upper respiratory tract
infection along with sinusitis
. You will need to visit a doctor to get a prescription for antibiotics for the same, also he might advise an x-ray of the PNS.In the meanwhile you can take an antihistaminic or a decongestant along with steam inhalations to cough
out as much expectoration as possible. You could use those combination drugs which contain both decongestants as well as anti-inflamatory to ease the pain and the post nasal drip
.Do consult a doctor and get yur antibiotic prescribed. Take care.