No Longer Creative.

I don't know why I can't do anything creative anymore. I feel like I just lost that spark in me that allowed me to do the cool stuff I was able to years ago. It just withered up and died inside of me one day. I can't make music, I can't write, I can't draw, I can't do anything. What happened? I can't even think of entire stories in my head like I was able to years ago...