I Have A Problem With My Jaw On The Left

I have a problem with my jaw on the left side. It starts to hurt seems to swell up when I am eating. My stomach then gets very upset, I sweat profusely, I feel real hot, my face turns beat red and a few of the times I actually fainted for a few seconds. If I sit and wait, it finally goes away. Four different doctors can not find anything wrong. A fifth one said it was a saliva gland swelling and putting pressure on the Vagus nerve. They can't tell me how to treat it. Maybe suck on a sour ball or massage that area is there best solutions.