Hi, I'm 15 Years Old. During The Week This Week

hi, I'm 15 years old. during the week this week (and every other week) I am on a very strict diet and I exercise everyday. but on the weekend, I went to my friends house where I ate a lotttttt of food that I knew I shouldn't have but I coudlnt control myself for some reason and I just kept eating. so, I just woke up about an hour ago extremely nauseous and puked up a lot of what I ate this weekend. (note: this has happened at least 3 other times).. my family and I think it is because all of the food that I ate that I'm not used to eating. therefore, my question is, could my problem of getting very sick and nauseous be that my body isn't used to all of the food ?