What is wrong with me? i forget things easily, have variable moods and levels of motivation, nose throbbing, random headaches, and dizzy spells.

Hmmmm.....: You sound like an intelligent young man. Those are what you call nonspecific symptoms, meaning it could be a wide variety of things, from the throes of adolescence to something serious e.g. Very high blood pressure. You can rule out pregnancy (obviously). You should really discuss this with your parents. Also, be aware that some pediatricians are better than others at treating adolescents.