I've been experiencing some really scary symptoms. For the past 2 nights I've waken up in the middle of the night out of breath ,like if someones was smothering me with a pillow or something, and every time i try to fall asleep i feel that sensation again. It happen to me like a year ago, and i went to the ER they did a chest X ray and told me it was normal. I've been experiencing anxiety now for 13 years and it's really hard . don't know if this is part of anxiety or what? Has anyone ever felt this?