I'm Sorry Was That A Truck That Just Hit ME?

I love it when you are going along thinking life is great and all is well and then bam! In one moment everything changes. How come that happens? Why do we have to have ups in our lives and downs? I'm an even keel kind of person, well at least I think so. I don't like things going up and down for a lot of reason. I sure hope tomorrow is different. I know I'm being vage just don't want to go into it but man I had no idea that this thing was going to hit me so hard like a truck hitting a wall.