I get this from time to time, not had one recently though. So frightening, gasping for breath. Been going on for over 20 years with me, still here, touch wood, so nothing to worry about. I found the more I worried about it, the more likely it was to happen. Went on a course of lanzaprosol recently and that set it off again. Try not to think about it when you go to sleep, easily said I know. Hopefully will cure itself.