What does it mean when you feel leakage in your brain and then hurts very bad?

There is no such thing as "leakage in the brain." Your brain is protected by a hard skull and multiple layers of protective membranes. It is impossible for your brain to "leak."

If you are experiencing pain in your head, you should see a doctor to determine the cause. Head pain is a common symptom of many conditions, some of which can be serious.