Hi,
I would say try steam inhalation as there is a possibilty of acute sinusitis. Also get your blood pressure checked. Since you have light sensitivity it can be migraine but migraine headache usually occur on one side of the head. Take OTC painkillers for headache. If it persists please get yourself checked by a physician.
Big important question - Do you have a history for headaches be it Migraines, Tension, Sinus or any other?