I have had this happen many many times, and it feels like a life or death situation each and every time. Impending doom that we are aware of, yet do not understand. I have been paralyzed by fear the same way you describe. If you have a doctor you should probably tell them and get a good answer. I personally don't have a doctor, so I cope day to day. Listening to calming music usually helps me, and also remember HALT- Never get too Hungry, Angry, Lonely, or Tired. These can trigger any fragile part of your life. Yours truly, Lightbulb7