It is most likely to be due to sinusitis
and throat congestion
You should continue with the antibiotic with steroids
for 05 days and take an oral decongestant such as combination of loratidine
twice a day for 05 days and with pain killer such as panadol 500mg thrice a day for 03 days. This will surely help you and you will find that good in a day. Also take an antitussive such as Acefyl cough syrup 02 TSF thrice a day for cough for 05 days.
I hope I am sucessful in solving your query If you have more you can ask me.
Dr. Azhar Sattar