Feeling numb

Have you ever felt numb? not in a physical way but in an emotional way. it´s like when something really bad happens or you happen to experience a real shocking moment in your life but you have no reaction until some time passes. well imagine that but just out of nowhere, without a reason or something triggering it. Idk if I´ve already went through a lot of stressful and traumatize moments in my life to the point  where my brain just doesn´t want to deal with it anymore, so I go "numb" for days, weeks, until I explode