Hello ans welcome to HCM
The most common cause of yellow colored discharge from nostril
is bacterial infection. A history of cold
favours an infectious pathology.
However, since the discharge is associated with headache consult your physician and get a CT scan
This is to rule out any injury
to the skull which could have resulted in seepage of fluid from nose.
Clinical examintion and investigations are necessary for the management of the problem.
So, visit our fhysician at the earliest.
Thanks and take care
Dr Shailja P Wahal