I had sudden shortness of breath about 6 months ago and went to the hospital where everything checked out normal.  My guess was it was just my first panic attack.  I've had this shortness of breath and fog on and off since then, but recently I've been in a fog everyday.  When I'm in this fog I can't eat anything and I have periods of time where I feel like I'm just going to lose control.  Idk if this is still anxiety or part of another issue. Ps - not on any medication for this