Any tips to help with teeth grinding (10 points for best answer)?!

I'm a teen and I am under a great deal of stress on a regular basis and lately that stress has been causing me to grind my teeth a lot, my jaw doesn't even relax anymore it's always tense and I always seem to be grinding on my teeth. I hate it and I want to stop but I don't know how, I have very bad jaw pain and headaches, and not to mention I chipped my front tooth grinding all the time. Please, if there is anything I can do I would love to hear your suggestions, for the sake of my teeth. Thanks.