im concerned I sometimes wake up do to my heart racing, numbness in my left arm, dizziness, difficulty breathing, shakiness, dry mouth and a feeling that I m about to pass out. This never happens when I m awake it only happens when i m sleeping. I am a female age 29 weight 191 height 5 6. I have metro valve prolapse and thats about it. What can it be? This is scaring me because its a horrible feeling I am scared to fall asleep. It doesn t happen everyday either