Normally acute sinusitis
infections are viral in nature and become all right in 7 to 10 days.
If you are still having these symptoms ,it means either you had a bacterial sinusitis which didn't respond to AUGMENTIN
or your sinusitis could be fungal in nature.
What to do...
Consult an ENT surgeon and get CT scan
Get the nasal swab culture or the culture of nasal discharge done.
Till you consult your doctor,do steam inhalation three times a day and avoid cold drinks.
I hope it helps.