Hi, Welcome to HealthcareMagic
By the nature of your symptoms, you are most likely suffering from chronic unilateral sinusitis
. Consult an otorhinolaryngologist in this regard. An x-ray/CT Scan
of the paranasal sinuses
may have to be taken. Steam inhalation and hot compresses may have a soothing effect. The fact that you bumped your head 3wks ago is most likely incidental.