He has done this for years now, and no one can find a reason. He has had MANY tests done with no explanation. They usually last for 2-5 minutes and then fade away. they are sometime so bad that he breaks out in sweat and has gotten dizzy a few times. It stopped for about 2 years, but he is having these episodes again now and they really are painful. Years ago they decided it was stress related, because they never found another reason.