How can I stop grinding my teeth?

I went to my dentist and insurance wouldn't pay for it but he custom made me a tooth guard that fits between my two middle top teeth and the two right bellow. The thing looks totally simple yet cost me $300+ But it eased up the severity of my head-aches buy a million, well by a lot. Try Hypnotics? You could probably go to a sporting goods store and buy a mouth guard, like you would use in boxing or wrestling or some other sport where you tend to get knocked in the mouth. I think you can put it in boiling water and before it cools too much shove it in your mouth clamp down and it will form to your jaw.