Many causes: Tests that should be done besides the ones you list: d-dimer, BNP, CBC, TSH, BMP, CXR. If d-dimer positive, need chest CTA. If all are negative, methacholine challenge should be considered. If all are negative, and if it fits, consider stress as a cause as stress is, in fact, a well known cause but a diagnosis of exclusion.
Answered 1/5/2019
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