These sound like severe panic attacks. I get the fits of restlessness but I don't have the crushing wave attacks with them. I do get the crushing wave attacks when I'm in a severe depressive episode. For me, such episodes are caused by severe emotional trauma or missing my anti-psychotics. I will get waves of physical pain that lock me up and I cry uncontrollably. The pain happens at more or less regular intervals until the wave has passed. There isn't a set time of duration for the attack, usually, it sputters out within an hour but I've had days where multiple attacks last from morning until night.