Teenage Depression

My sleeping pattern has changed, I am constantly pushing people away from me, and very oftenly I find myself tearing up for no reason. For the past couple months, I keep finding things wrong with me. I have been asking my parents to let me go to the doctor, but when they ask me to explain what exactly it is thats wrong, I can't put words to it and the issue is put asside. The problems started out with constant mood swings/cramps, which i blamed on PMS (only there was no break, I seemed to be constantly PMSing), then I was having lower back pain. I have had decreased appetite. The odd thing is, there are areas that I have had decreased motivation, but in other areas (school, home chores) I have periods where these tasks seem so impossible and unconquerable, and then a few days where I get on top of things and feel great (usually 2 or 3 days), then i am back to my unmotivated self. Am I possible experiencing depression?

The symptoms you describe are common for depression. A psychiatrist can make a correct diagnosis. Depression can be treated with cognitive psychotherapy and Prozac. St. John's Wort is also used for mild depressions.