Body dysmorphia--all of a sudden?

Lately I've been feeling I look "normal" or not as thin as I was before (like compared to a month or two ago) even though I've hardly gained any weight in the past month and in fact I think my weight has slipped by a couple of pounds in the last week or so. My main problem is with my arms. I don't feel fat; it's just that I see myself as bigger even though my weight hasn't changed/dropped a little. Why am I getting (mild) body dysmorphia all of a sudden? How to deal with or get rid of it? 

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