Hi. My Name Is Brian. I Am Trying To Figure

Hi. My name is Brian. I am trying to figure out if I have some sort of medical condition or issue. About 17 days ago, I weighed 208 lbs. Today I weigh 193 lbs. How I lost that weight in that short amount of time is I would go about 2 days at a time without eating anything and hardly drinking anything. My question is this: Even though I lost 15 lbs. I still have the same belly fat around my belly looks like as I did when I weighed 208 lbs. Could there be a serious medical issue/condition happening and going on with me? Thanks!! Brian