It seems from the history that you are having continuous headache which worsens as the day progresses.
This can be caused by eye problems like refractive errors or ENT causes like sinusitis
or primary headaches like migraine, tension headache
and cluster headache
This requires evaluation to find out the underlying cause and treatment accordingly.
As of now you can take analgesic
drugs for pain relief and do consult your doctor for examination and treatment accordingly.