I had this on and off for years. Three trips to the Doc and no diagnosis. However after the last one the Doc did say to go back for tests if it did not clear up. Luckily that was my last episode (about 4 years ago).
I was sometimes so bad I would have to get up at night, and sleep half sitting up on the sofa, because I could not bare to lay on that side of my face (right side). I think is was TMJ and it would flare up when I was under stress. The last time was when I left work and the dog was very ill and died, all in the space of a few months.
Touch wood have had no repeat, so must me more chilled.
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I do think 'mindfulness' meditation has helped though.