Oohhhh darling. I know you don't think so right now but your mom is doing a very good thing for you. To be blunt, you are killing yourself. You probably don't think so at the moment but you are. Your mother sees it, your doctor sees it, i'm sure other people in your life see it.
The first thing you have to understand is that no one, absolutely no one, is happy with the body they have. Some want to weigh less, have more muscles, a bigger chest, smaller thighs, blonde hair, different nose, etc. I myself am not happy with my body, there are parts I wish I could change. But you eventually realize that this is who you are, people love you regardless of what you look like and you learn to accept yourself. There are days I wish my belly was flatter, my thighs didn't jiggle as much and on those days, I work out a little harder and eat a little healthier and leave it at that. I've stopped striving for perfection and settled for being healthy.
You think that not eating will bring you a better body and happiness. Let me tell you what it will really do to you. First off, you will have no energy. Just walking across the street will make you tired. Your skin will become sickly looking, your hair will begin to fall out and you will get the shakes. If it continues, your gums will begin to bleed, your teeth may fall out and your face will become sunken and hollow. Your internal organs will begin to shut down (kidneys, liver, etc) and by the time it gets this far, death is a very real possibility. In the end, instead of being more beautiful and happier, you will have no hair, very old looking skin, unable to even stand up and support your own weight. Stunning picture isn't it?
You have started down a dangerous road that, unless you change something now, will lead you to a very early, painful death. Its a simple fact. People die from this every day. Think of the things you would miss out on when you are too weak to even sit up in bed or worse, you die. All the christmases left to come, birthdays, never having children, never having grandchildren, never traveling to all the places you've dreamed of traveling. You will miss out on life.
I watched a very good friend battle anorexia in high school. It got so bad her parents sent her to another state to a treatment center for several months. She missed out on a lot and this was during our senior year. She threw away what was supposed to be the best year of school. You are right about the doctor. If you don't start changing things today, you will end up in the hospital - ivs in your arms, daily psychologist visits, etc. And if it got to the point that you needed a feeding tube, they don't stuff it down your throat, they make an incision in your abdomen and put the tube directly into your stomach. Leaves a nice scar you can show off during bikini season.
Listen to your mom and listen to your doctors. They care about you and don't want you to destroy your life. I don't want you to destroy your life. Get yourself help and change things before it is too late. You don't want to miss out on the rest of your life. You'll always regret it.