You need to go see a doctor. There are to many possible reasons for this and the only way to find out for sure is to see a doctor for testing. You will also need to let the doctor know everything you know about what is going on. Like when did it start, how many times a day does this happen, have you had any kind of head injury and anything else that will help them come to a solution.
You should see a doctor or the school nurse. I would start drinking more water, gatorade for electrolytes, and improving sleep quality. Make sure you eat breakfast as that's something I never did in high school. Do you lose consciousness when you are doing something?
No, it didn't happen elsewhere then school ,I eat my breakfast almost everyday ,I drink a lot of water more than a usual person do :-) and a lot of veges and meat :)
Thank u for your respond