Can anyone give me a HEALTHY diet (I'm 14)?

So I am a 14 year old girl, 5'7" and I weigh 126.5 pounds. Since thursday I have ben going on a diet of about 250 calories a day. I lost a lot of weight in this short time (about 7 pounds) but today I experienced some problems. I woke up and practically fainted 3 different times, and I was having a hard time breathing. I found out this was because of my unhealthy diet. I just need to lose about 11 pounds by the end of august, but I would like to begin again in a healthier way where I am not starving myself like I was before. I would like a healthy diet and exercise plan to follow each day. 10 points for best answer!! Thanks