Runaway Train

When you're hit with a bout of anxiety, whatever the reason, it hits you like a runaway train. You can kind of see it coming, but by the time your eyes have focused and you realize what it is, it hits you. And while it's running you over shredding your body limb by limb, wheel by wheel, you're also standing alongside the tracks watching it pass. Car after car, you marvel at the speed with which it's passing by. It feels like there's nothing you can do to stop it. It's sheer speed and strength make you wish you had shot yourself before it hit you are overwhelming.