hi, candy.
i can't speak to whether it could be anxiety or some other cause. all i can tell you is that i had surgery 2 years ago for an asd after having a stroke (i was 30!).
anyway, i had gone in for 10 years complaining of breathlessness. i had numerous stress-echocardiograms. never did a problem show up. the moral of the story is that these tests are not as foolproof as they'd have you think. i would recommend a second opinion to be sure. it would be worth the peace of mind.
best of luck...
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