1cm sliding hiatle hernia, echo and cardiolite study perfect in mar '13. short of breath sometimes doing small things not when exercising hard why?

Shortness of breath: ...When unconnected to exercise or an actual physical problem, is the typical presentation of panic attacks with hyperventilation. Other causes possible but rare.

Shortness of breath: If you have a negative cardiac workup next you should see your pcp and or a pulmonolgist , so you can see if they have pulmonary causes or exercise induced asthma been ruled out?