Do some kind of exercise that will get your heart beating at twice your normal rate and keep it beating at that rate for 15 or 20 minutes. Aerobic exercises include rapid walking, jogging, swimming, tag football, basketball, handball, or anything that gets your heart beating very quickly. When these techniques don't work, when anxiety is serious, get help. If you become withdrawn, have frequent thoughts about death, get depressed and stay depressed for more than a few days, or have feelings of hopelessness, see a counselor. Depression and anxiety are common among students.
Suicide is the second leading cause of student deaths.
This is a tragedy because the conditions are treatable. Many schools have counselors available or they can refer you to community agencies where inexpensive counseling is available.