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I've had this problem for over 40 years....on and off....on again now...  I was always told it was sighing resperation, panic disorder.   I was under control for many years, but since Thursday, they are full blown again.  Can't take deep breaths, can't yawn and it lasts for ours even after taking a tranquilizer.  Called an ambulance on Friday and they found nothing wrong with me.   I am not in a constant state of panic.  My doctor just changed my meds.  Took me off of Prozaz and Klonopin and switched me to Zoloft and Valium.  Had an ekg a couple of months ago and it was within normal limits.  I just made an appointment to see a cardiologist just to make sure my heart is okay.  I am 58 years old.  HELP!