Why does my self-appreciation fluctuate?

Why does my self-appreciation fluctuate? I have dysmorphia and there will be times that last between hours to sometimes days where I hate myself. I hate what I see in photos, I hate what I see in the mirror, I hate any piece of music or art I create, and then all of a sudden, I appreciate and love myself. I love who I am, I'm a fan of the poetry I create, I'm a fan of the music I create, I love my face and my body, and then the cycle continues and I hate myself again.

Why does this happen and what are some ways to break it?
Why does my self-appreciation fluctuate?
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