Sharp pains in my head, eye dryness, why?

Not sure. These are usually two unrelated symptoms. Dry eye has many causes: as a result of eyelid inflammation, age, certain systemic conditions such as auto-immune disease, side effects to systemic medications. Try over the counter artificial tears for relief and see ophthalmologist if persists.
Eye Irritation. The sharp pains and eye dryness canbe due to many causes. I would go see an eye doctor for evaluation. In the meantime, i would use frequent artificial tears to lubricate the eyes.