Help!! I'm 13 and weigh 210 pounds!!?

I live with my mom who is big. She weighs about 260. I went to stay with my dad who lives across state as i had some time off school. I lost my bag on the plane so I had to borrow some of my dads clothes. He gave my some jeans and a top and they were to small. I was so shocked and angry at myself. Once I finally told my dad they didn't fit he dragged me to his doctors (not litterly) were the doctor weighed me ect. I weigh 210 pounds and I'm really short at only 4"9. That puts me above the 99th percentile and very obese. I also have very high blood pressure and I got tested for diabetes there and then and I have it. He then sent me to this gym thing were they worked out how fit I am ECt and the guy said that the fact I could only run for 45 secounds without me getting tired was awful. I ran for 2 minutes and had to stop as I was too tired. My dad is now saying he's not taking me home as my mom must be neglecting me bit she isn't. It's my fault I'm fat, I sneak food all the time!! What can I do???