Depending on how far aling you were, it could be possible that you didnt have a conplete miscariage and there is still some pregnancy tissue in you, or its taking longer for your hormones to drop (especially if they were high, like 50,000+) or you are stressed and worrying which is causing your lack of appetite.
Maybe go see your doctor and ask for another blood test to check your hcg levels have returned to 0
You'r hormones can stay high for a while after a miscarriage sometimes having a dilate and curate can help