I had a sudden shortness of breath in the morning while i was sitting on my bad singing?

Nonspecific: This was a nonspecific episode and could have been be cardiac,pulmonary,or anxiety related. Since no other description of any associated symptoms is provided, it's not possible to speculate about a diagnosis. If you felt perfectly normal right after the event, it would be reassuring that it was not a serious situation. Should symptoms recur, provide any other information and consult a physician