They are very random and can occur when she's sitting, walking, running or laying in
bed. They also can occur once in
a day or week, or several times in
the same day. She has had ultrasounds, xrays, mri's, vein tests, nerve tests, etc., and no doctor yet has diagnosed her problem. It scares the heck out of me sometimes because it comes on so quick that there is a violent jerk reaction followed by cries of pain and agony.