Blast from the past

The title says it all. The past, you wanna forget about it but you can't- you wanna leave it behind but it follows and creeps along you behind your back hidden/concealed from the view. It only needs a trigger to bounce up on you and you never know what the is the trigger to the silent gun. Noiselessly the bullet pierces your mind and leaves you baffled and confused. You dwindle on the intricate fibers that present in your mind regarding all the past and leaves you with a lost look with no coming back. Your mind becomes your ow n enemy.