Lyric discussion by ofpartandparcel 

I definitely think this song is about being Bipolar.

"This is the part of me that needs medication..." (etc.) is when you're depressed. You realize you're depressed and it's somewhat unbearable, and you feel medication is the only way to help.

Then, when the song starts getting really upbeat, it describes a Bipolar person's mania perfectly. Totally manic and crazy and thinking nothing's wrong, and you just "don't know". You don't know why you're as happy (or manic/crazy) as you are at the moment, you just are. Your thoughts race and you're going 100 miles an hour.

Then suddenly, you start to slow down again. Crash, almost. This is towards the ending of the song, when it starts to slow down again. You're just too low again.

idk, that's how it is for me, and what I got out of the song. ha

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