An episode, three or four minutes in duration, that begins with a seeming gradual tightening of my skin for a couple of minutes, and then a relaxation over about the same period. The feeling is semi-intense, but not painful, and there is no loss of consciousness or change in my pulse rate. I had three episodes in one day five or six weeks ago, and was examined by a doctor the next day. He found nothing abnormal, but ordered an MRI of my brain, which showed no abnormality. The phenomenon has resumed, and I have has six or seven more in the last two days, the most recent an hour ago. I am 93 years of age, and have always enjoyed good health. A broken hip, the result of a fall from a bicycle a dozen years ago, has gradually reduced my customary daily exercise almost to the vanishing point. I take diltiazem for atrial fibrillation -- I have had half a dozen episodes over four or five years, and that is the only medication I take, apart from a baby aspirin.