Wow I posted this a year ago. Thought it was lost and forgotten.
I've been to the doctors about this only recently and they too mentioned TMJ (Which I do have) or they otherwise didn't know. The thing is, I've noticed to get the same pain when I would smell a strong scent from the food I am eating. I was eating mac & cheese in school and as I brought the spoon up to my mouth I got a strong smell of it and got the sharp pain in my jaw area.
My family doctor said that for it to be the saliva glands it'd be in the area right in front of the ear but when I get the pain its right along my jaw bone all the way down my face but it is not the jaw itself.
My dad told me he had the same exact problem and still has it occasionally so you may be right by it being hereditary. Do any of your family memebers have this problem as well? If you go to any more doctors please update me on what they said.