Our brain literally stores every single moment and event that we experience. It is stored in our memory bank. The thing is sometime we may have difficulties recovering some of these memories in order to find out what actually happened in order to heal them. Our memory has failed us.
To put in proper perspective, our memory is always intact. It never fail us. It is the method we use that is not so effective. For instance, you vaguely know that a certain emotion is trigger by a certain event when you are still young. But you could not recall the age and exact happening. Based on the normal recalling, it has failed you.
However, you could adopt another way to help you uncover those buried memories. One effective way is using hypnotherapy.