Fatigueness is because of lot of reasons..most commonly because of anemia. Cancer is one of the cause,but,not the only cause.
Based on the other symptoms,your headache is because of decreased eyesight.
Usually at this age group cancer is less common.Dont worry about that.
It is advised to visit general physician and ophthalmology doc to get a eyesight checked.
Next Steps
visit a general physician and ophthalmology doctor
Health Tips
take multivitamin tablet daily, eat lot of
vitamin A rich foods,carrots and spinach.