Hi, i've had an off and on headache for about 4 days now. it's located on the top of my head in the center. it comes and goes, and when it's occurring, it's not bad at all, but i notice its there. it feels like slight pressure. i am 14 years old, and about 5'5". i'm average weight and have no other known medical problems. i've had a slight cold for the past week or so and think this might be a part of it. i'm a hypochondriac so i always think the worst. it hasn't gotten worse really, but it's been coming and going for the past few days. what's wrong?