Why do I keep dreaming about my death?

For the past 3 weeks, I have been dreaming of myself dying. It's been happening every night. Each night it gets scarier. And I always die outside somehow. Once I was laying in the road and couldn't get up, another time I was hanging by my thumbs in my garage, another time I fell off a really tall shelf my garage, another time my garage was filled with smoke from my mom's cigs and I choked to death. Another time I was playing in my driveway and this guy came up and strangled me and then dragged me in the garage. In each of them my mom is in the house, and comes out to find me dead. I am really scared by this. I hate it and want it to stop. I've been doing peaceful things before bed but it's not helping. What could this mean? I am scared to death of dying soon. I'm even to scared to go outside. HELP!