Do I have body dysmorphia or am I fat?

I have previously been diagnosed with anorexia and am struggling again. My BMI is underweight however I almost don't believe it as I still look so fat in photos! I feel better looking in the mirror but then I see photos and want to die. This is me, not breathing in or anything. Do I have body dysmorphia or am I genuinely fat? I don't know what to believe!