I've never found a way to stop or ease it, I just let it take over me until its finished and I've somehow calmed down. Mine seem to be caused by lots of different stresses building up, especially related to romantic emotions, so I'm just trying to avoid too many stresses building up and no longer attempting to have some sort of romance in my life. Although I will admit being single is rather lonely and boring! But for now if it works, at least until I sort out other stresses then I guess its worth it to avoid any more attacks.