I have experienced this a handful of times in my adult life as well, and I absolutely hate the feeling...sometimes it can be painful. I'm not sure what causes it either, and I've tried to pinpoint the cause by reviewing what I could have done during the day to cause it. A couple of times, quickly drinking a large caffeinated beverage about 30 min. prior cause the problem, but sometimes it's a mystery. Unlike you, this can hit me during any time of the day.
Normally, when this problem comes up I just bear the torture for 15-20 minutes and the feeling goes away. If it happens at night, I normally fall asleep after the pain has subsided a bit.
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