Constant sharp head pain in one single spot of my head. What could it be?

[R.Hawkins]

I've been feeling this very sharp head pain (its not a headache) on the right side of my head, on 2-4 inch spot. I've been feeling this for about 3 months now, so it is pretty new to me. Its a very different, weird pain, and I have never felt anything like it before. It only lasts a couple minutes, some times even seconds, and than goes away, but it comes back about 5 times a day, sometimes everyday. It also gives a "pulsating" feeling when I move my head, and most times when it lasts more than a couple minutes it causes my right eye to hurt too. I don't want to tell my parents about it, because they will either think I'm being overly dramatic, or that I'm a hypochondriac. I'm 17 years old, 5'8'', 130 lbs, no medical history of any serious disease (besides pneumonia when I was 5 and again when I was 7). I don't eat breakfast and rarely eat dinner (but I do snack once in a while), and I don't eat a lot of greasy food. Don't really exercise, and I have been very stressed lately (senior year of high school). I've been having slight memory problems lately (for example, sometimes I start walking somewhere, but suddenly I forget what I wanted to do there, or where I was going. Very often I am watching a tv show, and during the commercials I forget what show I am watching. And also, sometimes I am doing a homework, and I want to search something on google, but by the time I open the browser, I forget what I wanted to search. I've also been forgetting people's names very often). I am very worried about these head pains because they are not like anything I've ever felt before. I was wondering whether it is stress, or migraine, or maybe something as serious as a brain tumor.