It almost sounds like you could have Cyclothymia... I learned about this last year in one of my classes... but I will give you the web definition..
Cyclothymia, also known as cyclothymic disorder, is a milder form of bipolar disorder. Like bipolar disorder, cyclothymia consists of cyclical mood swings. However, the highs and lows are not severe enough to qualify as either mania or major depression. To be diagnosed with cyclothymia, you must experience numerous periods of hypomania and mild depression over at least a two-year time span. Because people with cyclothymia are at an increased risk of developing full-blown bipolar disorder, it is a condition that should be taken seriously and treated.
The only thing is I dont know how long you have experiencedn the symptoms that you are describing. I think when they say for more then two weeks they are refering to the mood swings themselves, now the period of time the moodswings last. If they have been like this for you for awhile, then there could definitely be something wrong, not just because you are a teenager. If you think that it is the music that you are listening to, then do you think you could change some things arou nd in yourself and see if these symptoms lighten up? That way you will know a lttle better.
I hope that you start feeling better hunny. If this all persists I highly recommend seeing a doctor. The sooner the treatment, the better.
Take care of yourself
x Kate