Could be tension type headache. Please take- 1) One tab. combiflam as when needed after meal. 2) take adequate rest, try power napping 3) Hydrate yourself, minimum 2-3 lit of water a day 4) can apply ice pack over head too 5) de-stress yourself, do yoga, meditation and neck stretching- relaxing exercises. Please consult if the pain aggravates, if you experience any eye pain, nasal discharge/ sneeze, vomiting.

Classical frontal ( tension type headache) Learn to handle stress. ..only then u can have a relief. ..

Check ur eyesight. Need other details.

Maybe due to many reasons.  Need proper history and evaluation.