Thanks for writing in.
Could you please provide me with some additional details?
1. Any fever/ cough/ cold? If yes, then headache might be due to sinusitis
2. Any nausea, vomiting, intolerance to loud noise/bright lights, along with the headache? Is it a throbbing headache
? If yes, it could be migraine.
3. Your age ,gender and other medical history .
Other possibilities are diabetes, hypoglycemia
, dehydration(not drinking enough water).
As a temporary measure; you can have a tylenol / paracetamol
Drink at least 8- 10 glasses of water a day.
Have a great day.