I always have jaw pains do to stress , lots of jaw pains cause by Bruxism (teeth grinding ) which I have since I was a child. The pains in jaw did escalate to maximum pain with fibro. Which also always worsen if you have to deal along with migraine , sinus, allergies, and facial pains. Cold or hot treatment always help doll the pains down. I also often use the pressure point technique to loosing some pains when it's unbearable. I push down the top middle point of my head with my finger tips while trying to relaxing my jaw down. Some time I pull my both ears to the side can help . And also sometime I use a wine cork between my front teeth trying to help extending my mount wide open to the max for a minute or two can loosing some tension. Same idea of stretching to relieve cramps aching pains in other parts of body.