What's the meaning of Lithium song (Evanescence) ?

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I think this song is about being "in love with your sorrow" (like how Amy said she was for a long time in a kerrang interview.) I know the feeling, it's sort of like... you're afraid to be happy, because you've been sad for such a long time and you're so used to it, anything else is scary. btw for most of these songs I'm just putting what I think the song means to Amy... it doesn't mean I think the songs can't be interpreted in other ways. So if you don't agree or have another meaning tell me about it ?