Hello and welcome to health care magic,
You always have a risk to get sinus infection
and this may be the case now also
You may need to take a course of antibiotic like amox-clav and antighistamine like levocetrizine in consultation with your doctor.
In any case you must also do regular steam inhalation and also avoid direct blast of AC or fan and also avoid cold
If these do not help then you must get a CT PNS and get back to me or any ENT with the report as soon as possible
Dr Sriram Nathan