Help For My Jaw?

About a year or two ago I realized that I carry stress in my jaw. When I'm stressed, my jaw can get pretty tight and sore. It seems that now things are to the point where my jaw can be tight even when I'm not stressed. And, there's this other thing going on where apparently I grind my teeth at night which has been wearing down the enamel on my teeth and has, as of a few months ago, required me to wear a mouth/teeth guard deal at night.This has all been quite annoying.What I'm wondering is this: if any of you have dealt with a tight jaw or have knowledge in this area, do you have any advice you can give me on how to loosen up and take better care of my jaw?